includes some tests for storage providers, more to come

Create OC_JSON class, for single point of creating json responses.
No real logic change, this just cleans up the code a bit.

Created the following function:
 - checkLoggedIn
 - checkAdminUser
 - redirectToDefaultPage

Start of the refactoring. Commit is quite big because I forgot to use git right from the beginning. Sorry.

add Open Collaboration API support. You can now connect your ownCloud with the KDE Social Desktop and push notifications to your Social News Plasmoid. This requires KDE trunk or KDE SV 4.5

<br /> is not a valid strict xhtml1.0 tag. Not semantic. Replacing it by CSS instructions on semantic tags.