Added Author to DataModel. Database-Migration.
Register-Form adapted to Membership.
Merge remote-tracking branch 'origin/master'

Conflicts:
	Assignment 3/LibraryManager/App_Data/Library.mdf
	Assignment 3/LibraryManager/App_Data/Library_log.ldf
	Assignment 3/LibraryManager/LibraryManager.csproj
	Assignment 3/LibraryManager/Register.aspx