Update to gradle plugin 0.7.+
Add more host URLs
Hard code a LOGTAG in order to get rid of the 'ambiguous method call' errors on Android Studio
Use latest build tools
Update hard-coded user-agents used for forcing web modes (phone vs desktop)

Make sure to check the Android version and use the old User-Agent for devices before Android 4.4, and the new User-Agent for devices on 4.4.+, this will assure better compatibility since Android 4.4 uses Chrome's engine for the WebViews
Mobile site URL: switch back to m.facebook.com
Always load the mobile site on all Android devices unless we change the behaviour in the preferences
Increment minSdkVersion to 15
Use destroyWebView() method