Refactor, bug fixes and version bump 0.0.6

* Fixed an issue with call using functions as params - funcId is now
binded to callback
* Added `this.remove` and `this.removeAll` to callback scope - this way
one can clean up invoked functions
* Added tests for the remove scope and functions as parametres
* refactored files
* www is now plugin (cordova cli)
* Cordova cli now just adds the meteor.cordova.js to the native www as
assets
* Bump to v0.0.6