Add multiple Cordova related things

* Started package for [Ionic Framework's](http://ionicframework.com) Cordova Plugins
* Added definitions for [cordovarduino](https://github.com/stereolux/cordovarduino) project
I saw https://github.com/borisyankov/DefinitelyTyped/pull/2473 is `plugins` added by Ionic or is it native to cordova (in which case it shouldn't be here but instead in cordova).