Update to BS 3.3.0 - https://github.com/twbs/bootstrap/releases/tag/v3.3.0.
Merge pull request #348 from gjb2048/master_BS3_3_0

Update to BS 3.3.0 - https://github.com/twbs/bootstrap/releases/tag/v3.3.0
Cope with API change.
Tweaks to file manager to make it look half decent.

Conflicts:
	style/moodle-rtl.css.map
	style/moodle.css.map
	style/moodle_min.css