Fixed flakey show answer test
Fixed flakey navigation tests by changing css

Now only check for the css that appears when the accordion is done
Fixed flakey check box by making a css_check function that behaves like css_click

As a result, changed inputfield to return the css, and all of the element.fill() to css_fill
Merge branch 'master' into jonahstanley/fix-flakey-tests

Conflicts:
	common/djangoapps/terrain/ui_helpers.py
Navigation now has a click success condition
Changed naming of attempts to max_attempts and changed css_selector
Changed format of docstring
Merge pull request #228 from edx/jonahstanley/fix-flakey-tests

Jonahstanley/fix flakey tests