diff --git a/2015/slides/mathml-in-web-engines-by-frederic-wang/Gruntfile.js b/2015/slides/mathml-in-web-engines-by-frederic-wang/Gruntfile.js
deleted file mode 100644
index f6c71e2..0000000
--- a/2015/slides/mathml-in-web-engines-by-frederic-wang/Gruntfile.js
+++ /dev/null
@@ -1,176 +0,0 @@
-/* global module:false */
-module.exports = function(grunt) {
-	var port = grunt.option('port') || 8000;
-	var base = grunt.option('base') || '.';
-
-	// Project configuration
-	grunt.initConfig({
-		pkg: grunt.file.readJSON('package.json'),
-		meta: {
-			banner:
-				'/*!\n' +
-				' * reveal.js <%= pkg.version %> (<%= grunt.template.today("yyyy-mm-dd, HH:MM") %>)\n' +
-				' * http://lab.hakim.se/reveal-js\n' +
-				' * MIT licensed\n' +
-				' *\n' +
-				' * Copyright (C) 2015 Hakim El Hattab, http://hakim.se\n' +
-				' */'
-		},
-
-		qunit: {
-			files: [ 'test/*.html' ]
-		},
-
-		uglify: {
-			options: {
-				banner: '<%= meta.banner %>\n'
-			},
-			build: {
-				src: 'js/reveal.js',
-				dest: 'js/reveal.min.js'
-			}
-		},
-
-		sass: {
-			core: {
-				files: {
-					'css/reveal.css': 'css/reveal.scss',
-				}
-			},
-			themes: {
-				files: [
-					{
-						expand: true,
-						cwd: 'css/theme/source',
-						src: ['*.scss'],
-						dest: 'css/theme',
-						ext: '.css'
-					}
-				]
-			}
-		},
-
-		autoprefixer: {
-			dist: {
-				src: 'css/reveal.css'
-			}
-		},
-
-		cssmin: {
-			compress: {
-				files: {
-					'css/reveal.min.css': [ 'css/reveal.css' ]
-				}
-			}
-		},
-
-		jshint: {
-			options: {
-				curly: false,
-				eqeqeq: true,
-				immed: true,
-				latedef: true,
-				newcap: true,
-				noarg: true,
-				sub: true,
-				undef: true,
-				eqnull: true,
-				browser: true,
-				expr: true,
-				globals: {
-					head: false,
-					module: false,
-					console: false,
-					unescape: false,
-					define: false,
-					exports: false
-				}
-			},
-			files: [ 'Gruntfile.js', 'js/reveal.js' ]
-		},
-
-		connect: {
-			server: {
-				options: {
-					port: port,
-					base: base,
-					livereload: true,
-					open: true
-				}
-			}
-		},
-
-		zip: {
-			'reveal-js-presentation.zip': [
-				'index.html',
-				'css/**',
-				'js/**',
-				'lib/**',
-				'images/**',
-				'plugin/**',
-				'**.md'
-			]
-		},
-
-		watch: {
-			options: {
-				livereload: true
-			},
-			js: {
-				files: [ 'Gruntfile.js', 'js/reveal.js' ],
-				tasks: 'js'
-			},
-			theme: {
-				files: [ 'css/theme/source/*.scss', 'css/theme/template/*.scss' ],
-				tasks: 'css-themes'
-			},
-			css: {
-				files: [ 'css/reveal.scss' ],
-				tasks: 'css-core'
-			},
-			html: {
-				files: [ 'index.html']
-			},
-			markdown: {
-				files: [ './*.md' ]
-			}
-		}
-
-	});
-
-	// Dependencies
-	grunt.loadNpmTasks( 'grunt-contrib-qunit' );
-	grunt.loadNpmTasks( 'grunt-contrib-jshint' );
-	grunt.loadNpmTasks( 'grunt-contrib-cssmin' );
-	grunt.loadNpmTasks( 'grunt-contrib-uglify' );
-	grunt.loadNpmTasks( 'grunt-contrib-watch' );
-	grunt.loadNpmTasks( 'grunt-sass' );
-	grunt.loadNpmTasks( 'grunt-contrib-connect' );
-	grunt.loadNpmTasks( 'grunt-autoprefixer' );
-	grunt.loadNpmTasks( 'grunt-zip' );
-
-	// Default task
-	grunt.registerTask( 'default', [ 'css', 'js' ] );
-
-	// JS task
-	grunt.registerTask( 'js', [ 'jshint', 'uglify', 'qunit' ] );
-
-	// Theme CSS
-	grunt.registerTask( 'css-themes', [ 'sass:themes' ] );
-
-	// Core framework CSS
-	grunt.registerTask( 'css-core', [ 'sass:core', 'autoprefixer', 'cssmin' ] );
-
-	// All CSS
-	grunt.registerTask( 'css', [ 'sass', 'autoprefixer', 'cssmin' ] );
-
-	// Package presentation to archive
-	grunt.registerTask( 'package', [ 'default', 'zip' ] );
-
-	// Serve presentation locally
-	grunt.registerTask( 'serve', [ 'connect', 'watch' ] );
-
-	// Run tests
-	grunt.registerTask( 'test', [ 'jshint', 'qunit' ] );
-
-};
diff --git a/2015/slides/mathml-in-web-engines-by-frederic-wang/bower.json b/2015/slides/mathml-in-web-engines-by-frederic-wang/bower.json
deleted file mode 100644
index 5561820..0000000
--- a/2015/slides/mathml-in-web-engines-by-frederic-wang/bower.json
+++ /dev/null
@@ -1,27 +0,0 @@
-{
-  "name": "reveal.js",
-  "version": "3.2.0",
-  "main": [
-    "js/reveal.js",
-    "css/reveal.css"
-  ],
-  "homepage": "http://lab.hakim.se/reveal-js/",
-  "license": "MIT",
-  "description": "The HTML Presentation Framework",
-  "authors": [
-    "Hakim El Hattab <hakim.elhattab@gmail.com>"
-  ],
-  "dependencies": {
-    "headjs": "~1.0.3"
-  },
-  "repository": {
-    "type": "git",
-    "url": "git://github.com/hakimel/reveal.js.git"
-  },
-  "ignore": [
-    "**/.*",
-    "node_modules",
-    "bower_components",
-    "test"
-  ]
-}
\ No newline at end of file
diff --git a/2015/slides/mathml-in-web-engines-by-frederic-wang/package.json b/2015/slides/mathml-in-web-engines-by-frederic-wang/package.json
deleted file mode 100644
index 64f3ef9..0000000
--- a/2015/slides/mathml-in-web-engines-by-frederic-wang/package.json
+++ /dev/null
@@ -1,44 +0,0 @@
-{
-  "name": "reveal.js",
-  "version": "3.2.0",
-  "description": "The HTML Presentation Framework",
-  "homepage": "http://lab.hakim.se/reveal-js",
-  "subdomain": "revealjs",
-  "main": "js/reveal.js",
-  "scripts": {
-    "test": "grunt test",
-    "start": "grunt serve"
-  },
-  "author": {
-    "name": "Hakim El Hattab",
-    "email": "hakim.elhattab@gmail.com",
-    "web": "http://hakim.se"
-  },
-  "repository": {
-    "type": "git",
-    "url": "git://github.com/hakimel/reveal.js.git"
-  },
-  "engines": {
-    "node": "~4.1.1"
-  },
-  "dependencies": {
-    "underscore": "~1.8.3",
-    "express": "~4.13.3",
-    "mustache": "~2.2.1",
-    "socket.io": "~1.3.7"
-  },
-  "devDependencies": {
-    "grunt-contrib-qunit": "~0.7.0",
-    "grunt-contrib-jshint": "~0.11.3",
-    "grunt-contrib-cssmin": "~0.14.0",
-    "grunt-contrib-uglify": "~0.9.2",
-    "grunt-contrib-watch": "~0.6.1",
-    "grunt-sass": "~1.1.0-beta",
-    "grunt-contrib-connect": "~0.11.2",
-    "grunt-autoprefixer": "~3.0.3",
-    "grunt-zip": "~0.17.1",
-    "grunt": "~0.4.5",
-    "node-sass": "~4.14.1"
-  },
-  "license": "MIT"
-}