Save HCP files into the dataDirectory from cordova.file plugin.

Rather than relying onto manual path manipulations.
For mobile autoupdate wait for both events to happen:

(deviceready, DOMContentLoaded)
Use the fixed cordova-update
bump the version of cordova-update
Bump version of com.meteor.cordova-update for Android fix
Merge branch 'cordova-datadir' into devel

Fixes for mobile HCP; save to datadir