First few fxg skins for the Android 4+ skins.
Included: ActionBarBackground, Button and Checkbox skins.
Better skins for ActionBarBackground, Button and Checkbox.
This time, we have registration point at top/left and scalegrid values from Illustrator.
This replaces the earlier ones which came from Fireworks.
Added cleaner versions of ActionBarBackground.fxg, Button_down.fxg and Button_up.fxt
Added skins for Android 4.x versions of ActionBarSkin.as and ButtonSkin.as
Merge branch 'develop' into new_android_skins

Conflicts:
	frameworks/projects/mobiletheme/src/spark/skins/mobile/ActionBarSkin.as
Resolve conflict
We do need to draw the background of ActionBarSkin
Added CheckBox skins and assets
Android 4.x skins for Checkbox.
Modified existing skinclass to eliminate need for creating FXG assets for every supported DPI.
New skin and FXG for RadioButton.  It uses the same FXG assets for all the DPIs
Bug in current ToggleSwitchSkin (needs to be merged back to develop asap)
New skin ToggleSwitchSkin for Android 4.x toggle switch
All visuals except label are in FXG.  All DPIs now use the same FXG assets.
Added measure() method so that the component knows its size
Android 4.x specific skins for ButtonBar component; Uses same FXG assets for all DPI
Android 4.x skin for TabbedViewNavigatorTabBar.
This ensures that the TabbedViewNavigatorApplication gets the new skin as well.
The css file that drives all the new skins for Android 4.x theme
New Android 4.x specific HSliderSkin
Fix tooltip for HSlider
Remove unused variables and clean up comments
Added a fill layer on top of track skin to indicate current value as a filled area
This layer updates its size based on the current location of the thumb
Fixed bug in current CalloutArrow