Move jquery .focus function calls to a JsHelper

Consolidated calls to .focus so that any potential future JS library changes are less painful.

https://github.com/ManageIQ/manageiq/issues/214
Add tests for new JS helper methods, fix broken specs

https://github.com/ManageIQ/manageiq/issues/214
Merge pull request #823 from bmclaughlin/js-helper-focus

Move jquery .focus function calls to a JsHelper