Enabled Travis Continuous Integration

The settings also permit running tests requiring a UI.
Extract setup method refactoring for SpriteTest
Made resulting Game visible in Launcher

To increase observability for testing purposes.
Bumped to 6, updated dependencies

And set character encoding in pom.xml
n response to maven warnings
Merge pull request #3 from avandeursen/travis

Enabled Travis Continuous Integration
Merge pull request #4 from avandeursen/sprite-test-refactoring

Extract setup method refactoring for SpriteTest
Merge pull request #5 from avandeursen/visible-game

Made resulting Game visible in Launcher
Merge pull request #6 from avandeursen/maven-pom

Bumped to 6, updated dependencies