Merge pull request #678 from kossebau/addVersionToWTEDir

Add "-$version" postfix to zipped dir of wodotexteditor
Make Java a required dependency

webodf.js needs it for closure compiler, and there is not much in the repo
which really makes sense to build without also building webodf.js
Merge pull request #677 from kossebau/makeJavaHardDep

Make Java a required dependency
Remove previous version of android app.
Add cordova app for viewing ODF files

This app works on firefox os and android. It will replace the android
app in programs/android.
The user interface has been rewritten and much simpler than the previous
one.
Make app target naming consistent with other product targets.
Also do not build them by default.
Install cordova in the top level node_modules directory
instead of creating a separate node_modules folder in programs/cordova.