tests for project filter package

refs #7

.travis.yml

@@ -1,3 +1,6 @@
 language: java
 sudo: false
-jdk: oraclejdk8
+jdk: oraclejdk8
+branches:
+  only:
+  - master

README.md

@@ -1,6 +1,7 @@
 # [Stellaris Mod Tools](https://github.com/Idrinths-Stellaris-Mods/Mod-Tools/releases/latest/)
 
 [![Codacy Badge](https://api.codacy.com/project/badge/Grade/23bfdba23039450aa3c16f06f93362ee)](https://www.codacy.com/app/Idrinth/Mod-Tools?utm_source=github.com&utm_medium=referral&utm_content=Idrinths-Stellaris-Mods/Mod-Tools&utm_campaign=Badge_Grade)
+[!Travis Build](https://api.travis-ci.org/Idrinths-Stellaris-Mods/Mod-Tools.svg?branch=master)
 
 ## Current Features
 

src/main/java/de/idrinth/stellaris/modtools/filter/FileExt.java

@@ -23,7 +23,9 @@ public class FileExt implements java.io.FilenameFilter {
     protected String extension;
 
     public FileExt(String extension) {
-        this.extension = "." + extension;
+        this.extension = extension.charAt(0) == ".".charAt(0) ? extension : "." + extension;
+        System.out.println(extension.matches("^\\."));
+        System.out.println(this.extension);
     }
 
     @Override