Merge pull request #249 from johan12345/master

Herford: Account support, iOPAC: IDs in search results, Save selected home branch
Allow visible fields
Store visibility in JSON cache
Don't crash on invisible fields
Fix invisible fields
The JSoup Update broke the SISIS parser
Add very optional "displayName" property to libraries. Avoid to use.
Run meanings tool
Merge pull request #250 from johan12345/master

Check account data before saving
Don't check user credentials if there are no credentials
Error handling in BaseApi and SearchFragment
added: HS Ruhr West, HS Heilbronn
Fix SSL host of EBS Wiesbaden
Prepare release
Merge pull request #26 from raphaelm/master

Update with latest commits from raphaelm