Preparing release 0.3.0

WIP

Upgrading to the latest version of Phonegap and plugins + moxie-js-client

Remaining work to be done:
 * [ ] bump version number
 * [ ] test contact plugin (pending API authorisation)
 * [ ] use moxie-js-client@master (or tagged version) instead of the testing branch
 * [ ] Android test #4 (geolocation w/o cordova plugin)
 * [ ] Android check calendar plugin
 * [x] iOS and Android notifications working
 * [ ] Prepare CHANGES text for AppStore and Play Store