world.css_click() helper instead of directly
calling splinter.

server is not created for cms tests.

and simulates an XQueue.

Changed constant to uppercase

that mongo caches are initialized for the test database.
This avoids a warning from the mongo modulestore.

Increased wait time for login screen to reduce false positives.

using terrain.factories.py and capa.tests.response_xml_factory

already exist

Updated login dialog handling to workaround multiple login dialogs
that sometimes appear on a page (where the first one is hidden)

problems.

Tag tests not working under PhantomJS to skip for now.

Includes adding a method for css_click_at.