Started index implementation
Merge branch 'development' of https://github.com/henke101/Mindy into development
Implemented much of IndexFragment

Implemented much of the IndexFragment (start screen), needs more
exercise types.
Also added new list item background, transparent navigation bar
Merge branch 'index' into development
Merge branch 'development' of https://github.com/henke101/Mindy into development

Conflicts:
	res/values/strings.xml