Adding ability for owner/admins to remove volunteers from tasks.

Task Owners and admins have the ability to remove volunteers from
tasks. This is done via the task edit screen.

Fixes #411
Moving volunteer removal outside the task edit form.

Moved the volunteer removal component off of the task edit form
and into a box like it appears in the project owner page.

Fixes #411
Free text and'd search
more real-ish demo data
cleanup
clean
clean search
Merge pull request #427 from ultrasaurus/devel-demo

more real-ish demo data
Merge branch 'devel-removevol' of github.com:DavidEBest/midas into devel
Merge pull request #423 from DavidEBest/devel-removevol

Adding ability for owner/admins to remove volunteers from tasks.
increment to version 0.0.24
Merge branch 'devel' of github.com:18F/midas into devel