Indicate to Android which activity modifies app settings

For details, see:
http://developer.android.com/guide/topics/ui/settings.html#NetworkUsage

Signed-off-by: Greg Meiste <greg.meiste@gmail.com>
Add context to many layouts to help Android Studio

Signed-off-by: Greg Meiste <greg.meiste@gmail.com>
Use Theme.Holo.Light.DarkActionBar for all activities

Gives application a unified look and feel.

Signed-off-by: Greg Meiste <greg.meiste@gmail.com>
Move theme configuration to application level

Signed-off-by: Greg Meiste <greg.meiste@gmail.com>
Use standard Android layout for accounts single choice ListView

Signed-off-by: Greg Meiste <greg.meiste@gmail.com>
Default to currently selected account on account select ListView

Signed-off-by: Greg Meiste <greg.meiste@gmail.com>
Use consistent font size in account select layout

Signed-off-by: Greg Meiste <greg.meiste@gmail.com>