Changin default driver to poltergeist

Signed-off-by: Arpit Goyal <agmps17@gmail.com>
Added tests for changing password by admin

Signed-off-by: Arpit Goyal <agmps17@gmail.com>
Merge pull request #20 from agmps18/tests_spec

more tests added
added seed for default workgroup
Added subtab for Settings in Shares
Added view code for settings tab page
Added PUT route and controller code for settings and updating workgroup.
Added JS code for AJAX updation of workgroup. This took time. Hooraah!
Merge pull request #21 from AnkurGel/bug/1079

Fix for Bug/1079  - Workgroup not settable. Great job Ankur
if there is not workgroup setting, it has to be created
Validation constraint added for workgroup
Merge pull request #22 from AnkurGel/bug/1079-validations

Validation constraint added for workgroup
Removing alert boxes, fixe message not appearing problem. Made some design twigs. Reentering slow animation.

Signed-off-by: Arpit Goyal <agmps17@gmail.com>