OPSK-81 - fix to send notication to project managers

when somebody signs up and indicates they are a member of the project
OPSK-81 project and institution selection during registration should pass id's

no need to pass the title as well, and then parse the string to split it
OPSK-82 - Prevent an project manager from removing themself from changing their own projects
removed old people_i_may_know method
get Person#institutions through work-groups

rather than through a manual method, use has_many=>through