Update .travis.yml
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Improved event managment (and other minor changes)
Event management:
- Added event emitter class, to homogenize all events handling
- Added event emitter for Touch Events
- Added Time event, for events that are produced after a given time
- Added event emitter for Time event
- Updated tech demo to include these events
Other things:
- Added originX and originY to transformations
Merge branch 'master' of github.com:e-ucm/ead

Conflicts:
	.travis.yml
Fix LwjglPreferences API change
Create CONTRIBUTING.md
Removed libgdx.so libraries libgdx.so is automatically added by maven, no need to keep a copy in repo.
Added nine patch renderer
Added test for Nine patch
Merge pull request #26 from anserran/ninepatch

Added nine patch renderer
Merge pull request #19 from anserran/input

Improved event managment (and other minor changes)
Merge pull request #24 from RotaruDan/master

Initial pull request: eAdventure Mockup structure