loading/get/unloading methods for Assets
Widget to show images that are changed externally
Test
Added icons
Added switch to change between single and multiple selection
Merge pull request #855 from anserran/asyncimage

Widget to show images that are changed externally
Merge pull request #856 from gorco/multipleSelection

Multiple selection
Projects always returned in the same order
Method for MockPlatform
Logo in skin
Worker executor
Load projects worker
More methods for assets, async image
Gallery widget
Tile widget
Set error handler
Removed skin parameter
Texture Drawable draw itself proportioned
Null widgets return 0 for prefSize
LoadProjects also load project title