Merge pull request #130 from Canbanizers/implement_boardmanagement

Implement boardmanagement
fix c715d7d
fix bug: user wasn't stored in localstorage on login
fix bug in join to userhasboard
add local DB_NAME to CredentialsReader.php
clear localstorage on entrance of the loginroute and unload all records from EmberStore
implement error if useracc already exist
Update usermodel
implement deletemode to get right response if deleterequest is send. catch all other nul- values for requests
update Dokumentation_new.odt
removed obsolete owner property on board.js #105