support the current spec

i'm switching https://github.com/michielbdejong/owncloud-owa over to the current spec, so i will be testing this branch and adding any bugfixes there may be.

there were apparently some unbuilt assets, or you build the assets in a different way than i do? i committed the output of my assets build.

the docs actually changed, two things:

- adding remoteStorage.getStorageType(). it has the same API as the already existing remoteStorage.getStorageHref() method.
- restoring missing build instructions.