fixed many-to-many relation between tags and events
added a method for retrieving users from database by their name
added a method for quickly adding some data to the database when testing on localhost
changes to models causes regression testing to fail. resolved this
 a tag is now any non-empty string isolated by a #; input "  #  # ##foo" will return only "foo", while everything else is ignored.
 A test was added to check this new feature.
Merge remote-tracking branch 'origin/feature/eventSearch' into feature/eventFeed