PLD: test and catch owner validation errors
PLD: assign owner var correctly
DW: Added test to recreate the issue
DW: All the users can remove themselves from a project. Test includede
UK/RR: fix PUT update on user profile endpoint
Merge pull request #707 from onaio/700_all_user_should_be_able_to_remove_themselve_from_project

700 all user should be able to remove themselve from project
DW: Added an endpoint for searching a user using an email
DW: Corrected failing test
DW: Used the django rest framework search filter