add mvc Identity Plugin
add Identity View Helper
Add Identity View Helper to overview
Rewrite Identity plugin after rebase
add additional info on how to add auth service to service manager
remove alternative method
simplify config example with just an invokable
Merge branch 'hotfix/804'

Close #804
Merge pull request #815 from maxnuf/patch-3

Add documentation for Identity Controller Plugin and View Helper
Merge branch 'hotfix/815' into develop

Forward port #815