#292 #53 - Setting minSdkVersion to 9 so that it includes all of Gingerbread. Removing uses-sdk from AndroidManifest as it's always overwritten by Gradle build.  Removing API check from Icon and MapTileCache as Environment.isExternalStorageRemovable() is in API 9.
Merge branch 'master' of github.com:mapbox/mapbox-android-sdk

Conflicts:
	MapboxAndroidSDK/src/main/java/com/mapbox/mapboxsdk/tileprovider/MapTileCache.java