[48470131, 48472491] fix two interview bugs

48472491: should stay on the same page after deleting interview on interview list page
48470131: new interview link should not disappear after adding assessment for a candidate on candidate details page

The first bug is a regression caused by changing literal value of Interview_Loop.

Signed-off-by: Henry Chen <hchen@vmware.com>
Merge pull request #112 from Henry-CF/interview

[48470131, 48472491] fix two interview bugs
Merge branch 'master' of https://github.com/vmw-tmpst/heroapp-LetsHire into id_column

Conflicts:
	db/migrate/20130411063008_add_columns_to_opening_and_add_assessment.rb

Signed-off-by: Henry Chen <hchen@vmware.com>
sync with master

Signed-off-by: Henry Chen <hchen@vmware.com>