Adds initial code and tests

.editorconfig

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+# This is the top-most .editorconfig file; do not search in parent directories.
+root = true
+
+# All files.
+[*]
+end_of_line = LF
+indent_style = space
+indent_size = 2
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[Makefile]
+indent_style = tab
+
+[composer.json]
+indent_size = 4

.gitignore

@@ -0,0 +1,3 @@
+/bin/
+/vendor/
+*.sqlite

Makefile

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+#!/usr/bin/make -f
+
+init:
+	composer install --prefer-dist --no-progress
+
+test:
+	bin/phpunit
+
+.PHONY: init test

composer.json

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+{
+    "name": "pnx/tree",
+    "description": "A library for working with tree implementations.",
+    "type": "library",
+    "license": "GPL-2.0+",
+    "authors": [
+        {
+            "name": "Kim Pepper",
+            "email": "[email protected]"
+        }
+    ],
+    "minimum-stability": "dev",
+    "require": {
+        "doctrine/dbal": "~2.5"
+    },
+    "require-dev": {
+        "phpunit/phpunit": "~4.8"
+    },
+    "autoload": {
+        "psr-4": {
+            "PNX\\Tree\\": "src"
+        }
+    },
+    "autoload-dev": {
+        "psr-4": {
+            "PNX\\Tree\\Tests\\": "tests"
+        }
+    },
+    "config": {
+        "bin-dir": "bin/"
+    }
+}