add users filtering to the user index page
change the event the script listens for
change form IDs and js according to them
change filter form according Brayans comments in github
pong to Sly: some changes to index and js
added jasmine tests
add jasmine test cases for users.js / as suggested by Yaro
fix old class expectation in specs
fix input id in user filter form
Merge pull request #509 from betasve/add_filtering_to_users_index

Add users filtering to the members index page
crated a scenario and steps
- wip
- Add UserNullable concern to handle instatiation of NullUser for the associations to handle case when the user delete it's profile
- Fix article spec was failing due to the fact that it was defaulting to the NullUser when created without an actual user
- Fix for failing specs for Hangout