[ui] Changed the way plugins are launched. Fixed #266

+ Added search boxes for required columns
+ Added a select all checkbox to the top of checkbox columns

Use Flow:

Want to launch all web plugins?
+ Search for "web" in plugin group search box
+ Click on select all checkbox
+ Run

Want to lauch passive plugins of web group?
+ Search for "passive" in plugin type and "web" in plugin group box
+ Click on select all checkbox
+ Run
Merge branch 'lions_2014' of https://github.com/owtf/owtf into ui