Fix compatibility w/ other plugins due to android-support-v4.jar

Changing android-support dependency declaration to be compatible with other plugins like phonegap-plugin-push and cordova-plugin-facebook4. Issue katzer/cordova-plugin-local-notifications#632

Updating id of android v4 support lib to latest

Updated the location for Cordova's platforms module

Updated the post-install script for iOS to look for the platforms module
in its new location. It'll look in the previous location too, so the
plugin should work on previous versions of Cordova too.