Simple to use editor component (non-collab for now)

This should be the future of the editor component(s). A simple API for 3rd-party WebODF editor interested, hiding all the internal complexity, so allowing us to throw things around as we need, without breaking things too much for that 3rd-party.

`make product-wodotexteditor` will create a zip file with everything needed for the editor component. Unzipping that file and following the HOWTO should make people happy. So far I successfully managed to follow my own text in there and get happy a little :)

Fixes #295 
Partially solved #195 (besides the compilation).
Initially it was planned to hint the CDN option to the users of Wodo.TextEditor as another option in the HOWTO. But to keep things more simple for them (less options is simpler ;) ) and to make the switch to Closure widgets one day not have any effect in how Wodo.TextEditor is used, it was decided to drop that and always use the amalgamated dojo. But as explanation/reminder to ourselves and readers of the sources I am proposing to keep this in the README.md for now.