Mark the test as non-critical until it pass on CI

Test is passing locally; we probably have a mistmatch between Firefox and Selenium WebDriver on Travis CI.
Merge pull request #453 from collective/issue_378

Fix carousel tile Robot Framework test
Fix modification time disappearing from context data and handling missing value
Added test for double population issue 449
Pep8 clean up
Moved dexterity item creation to Fixture setup - fixes test when profile was not ready soon enough
Refactor tests

Remove cluttering and move content type creation to the test to speed up execution time.
Skip test on Plone < 4.3
Merge pull request #454 from collective/issue_449

Fix double dropping content
Fix documentation in doctring
Do not build with jQuery 1.9.1

This will be moved to the branch implementing the compatibility.

See: https://github.com/collective/collective.cover/pull/455
Remove needless try/except
Merge branch 'master' into carousel_tile_with_cycle2
Merge branch 'carousel_tile_with_cycle2' of github.com:collective/collective.cover into carousel_tile_with_cycle2