formatting
make sure parsed times are set to UTC
convert datetime.now() to datetime.now(UTC) for xqueue
convert all datetime.now() to datetime.now(UTC)
It seems like self.tabs is getting set to an empty set [] now rather than None. This causes the tab defaulting to not populate, leading to crashes in the LMS if someone makes a new course with additional tabs (e.g. static tabs or pdf-textbooks)
add new test to assert that course creation will populate default tabs as expected. Also update factory to not override defaults on tabs array. Also simplfy self.tab test condition.
Prevent XSS attack via submission_history page.

Conflicts:
	lms/djangoapps/courseware/tests/test_views.py
Studio: revises spacing fix for welcome to edX studio title

Conflicts:
	cms/templates/howitworks.html
Merge pull request #481 from edx/fix/cdodge/regression-on-tabs-initialization

It seems like self.tabs is getting set to an empty set [] now rather tha...
Merge pull request #482 from edx/hotfix-2013-07-23

Hotfix 2013 07 23
Merge branch 'release'

Conflicts:
	lms/djangoapps/courseware/tests/test_views.py
Merge pull request #467 from edx/fix/adam/file-upload

Fix/adam/file upload
Add a manage.py command that understands the extra edX options
Merge pull request #451 from edx/cale/add-a-manage.py-command-that-understands-the-extra-edx-options

Add a manage.py command that understands the extra edX options
Add an XBlock student_view to XModule

This just wraps XModule.get_html, and ignores javascript and css for
now.

[LMS-189]
Merge pull request #477 from edx/cale/xmodule-student-vieww

Add an XBlock student_view to XModule
Merge branch 'master' into ihoover/automated_content_testing