Fixes interpretation of background=-1 while rotating an image.
Fix identation on composer.json
Merge pull request #6 from malukenho/patch-1

Fix identation on composer.json
Add PHP 5.5 to Travis config
Merge branch 'master' into PR-4
Changing New Image to New static 

This allows extending the image class, and getting the correct class  when  extending
Merge pull request #7 from ChrisFrench/patch-1

Changing New Image to New static