[46355881] support JD column sorting & filter JD via Title

use ransack to do the filter and sorting.

Signed-off-by: Henry Chen <hchen@vmware.com>
Merge branch 'master' of github.com:vmw-tmpst/heroapp-LetsHire into bugfix

Conflicts:
	Gemfile.lock

Signed-off-by: Henry Chen <hchen@vmware.com>
Merge pull request #67 from Henry-CF/bugfix

[46355881] support JD column sorting & filter JD via Title