wip: invite a friend registration
Merge branch 'master' into feature/friendinvite
Merge remote-tracking branch 'origin/master' into feature/friendinvite
friend invite wip
Update sample video.
invite wip
Fix forgot password pages.
wip: coded rudimentary invite a friend UI on question page

TODO: make this into a directive and make it pretty
Merge branch 'master' into feature/friendinvite
invitefriend: overlay ui.
invitefriend: now working.
Fixup email templates swapped in error.
Fix rights for tagging.

* Now project admins (only) can add and remove tags.
Prevent ordinary users from seeing tags.
Remove links that don't go anywhere on project and questions pages.
Minor grammar fix in jp front page.
Merge remote-tracking branch 'origin/master' into feature/projectsignup

Conflicts:
	src/libraries/sfchecks/Communicate.php
	src/service/sf.php
wip: project signup.