This solves issue #101 (forcing a full persistent removal of all json files before the model gets saved to disk)
A little refactoring. This creates a basic test class (EditorTest) that builds a mock platform and controller. Most editor tests would like to extend this class.
Changing the way project json files are removed to ensure all json files are actually removed, even if they are not referenced in project assets any longer
Creating a test for the EditorIO.saveAll() method
Changing SaveGameTest so it also checks that EditorIO.saveAll does not remove files with extension different of .json (e.g. images)
Fixing code style with maven
Proper logging for exceptions
Merge pull request #1 from anserran/fixes103

Proper logging for exceptions
Merge pull request #103 from jtorrente/issue-101

solves issue #101