Added some preferences for training timer.
Added new app icon (created by Olli Wiegner, http://www.olliwiegner.de/).

Changed the launcher icon & the icon of the main activity.
Added new app icon (created by Olli Wiegner, http://www.olliwiegner.de/).

Changed the launcher icon & the icon of the main activity.
Merge branch 'app-icon' of github.com:chaosbastler/opentraining into app-icon

Conflicts:
	app/AndroidManifest.xml
Added the license text for the new app icon.
Preparing release v0.5.2
Merge branch 'master' of github.com:chaosbastler/opentraining into wger
Added support for image downloading from wger.

Open Training will can now download exercises from wger including the images. If there's already an image with the same name, the download will be skipped.
Merge branch 'wger'