Add machinery for Ajax testing, and fixed the Posterior-Search RSpec
test that need to use it.
added test for posterior edit page
Merge branch 'master' into AddAjaxTesting
Merge branch 'posterior_edit_test' of git://github.com/udaysaraf/bety into udaysaraf-posterior_edit_test
Merge branch 'udaysaraf-posterior_edit_test'