[TIMOB-17493] Android window backgroundColor:'transparent' disable custom themes

*S*etting index window to backgroundColor:'transparent' somehow disable custom themes use. *S*imple project attached using greenstyle theme blog example [http://www.appcelerator.com/blog/2014/07/android-appcompat-library/] *Reproducing steps:* *1* - Create New project Simple Alloy *2* - Copy the Platform folder to your project root [https://github.com/ricardoalcocer/New_in_Ti_3.3.0/tree/master/AppCompat/abthemes] *3* - Change the tiappxml android tag to:

    <android xmlns:android="http://schemas.android.com/apk/res/android">
        <manifest>
            <application android:theme="@style/Theme.Greenstyle"/>
            <uses-sdk android:minSdkVersion="14"/>
            <uses-sdk android:targetSdkVersion="20"/>
        </manifest>
    </android>

*4* - Run a test (tested only on a Nexus 4), theme will aplly action bar will be green, alert message will be light styled. *5* - Edit index.tss add the property:

"#index":{
	backgroundColor:'transparent',	
}

*6* - Run a test (tested only on a Nexus 4), theme will NOT aplly action bar will be BLACK, alert message will be DARK styled.