Single click selects the invite link

- Earlier, triple-clicking or drag & select had to be performed to select
- Should consider a copy button

Moving away from the inline onClick handler

It didn't feel right to be writing js in a helper.

Refactoring setupInviteLinks into a sidebar Backbone View
Merge branch 'ssrihari-click-to-select-invite-link' into develop
Merge branch 'develop' of github.com:diaspora/diaspora into develop

Conflicts:
	Changelog.md