ticket:387 added add_message funtion to utils
ticket:387 added messages template tag
ticket:387 added message_remove view
ticket:387 added js for removing messages
ticket:387 increased js and css versions
ticket:387 added ui test for messages
ticket:387 add an error message on error while composing metadata/manifest/summary file
Merge branch 't387_messages_for_user_add_error_message_on_error_while_composing_metadata'