Add utility methods to handle illegal chars
Fixed AddReaderAccess to be language independent
Moved AddAdministratorsTenant to TenantExtensions
Fixed removedField to also allow removal of sitecolumns
Updated comment
Refactored AddReaderAccess
Added AddDefaultColumnValues list extension
Merge pull request #128 from pbjorklund/utilityillegalchars

Add utility methods to handle illegal chars
Merge remote-tracking branch 'contributor/fixes' into dev