Designer compiling in Xcode.
* Needed to put factory registration functions in Gwen::ControlFactory namespace.
Added Allegro platform.
* To support OSX I added an Allegro 5.1 platform for Gwen. This will also work on other platforms Allegro supports. Some features not fully implemented, like window minimise.
* Use Allegro clock.
* Don't crash if no file selected.
Fix sleep ms.
Merge branch 'master' of https://github.com/garrynewman/GWEN
Use correct float functions: ceilf and floorf.
Fix Allegro line rect drawing.
* Rect wasn't being translated.
* Clear screen on begin context.
Spaces to tabs.
Spaces to tabs.
* Gwen uses tab for indentation.
Merge pull request #35 from billyquith/master

Allegro platform