Fix documentation and test parameters.
Add support for ownCloud obs
More progress in building branded clients

new switch -n to skip tarball uploading, -c to add osc parameter,
some tarball name tweaks and other bugfixes.
Added OEM themedir parameter.
Add debianChangelog and oscChangedFiles utility functions.
Check for changed files in the osc package.

Only push to obs if really files were changed. Also add the tarball
to the obs package if it wasn't there before.