Moved the definition of autoplay attribute to videoalpha_module.py file. Changed double negative if statement for autoplay check to simple if.

Copied autoplay attribute from video xmoudle to videoalpha. Now students will have the video autoplaying, and in Studio it will be pause by default.

Move "stringy" functionality into xblock fields

Added rake jasmine:cms:browser:watch command

Remove the stores_state field from XModule

stores_state is now only used in a single test, in conjunction with
has_score. In practice, it's never the case that stores_state is false
when has_score is true, so we can delete stores_state entirely, and just
use has_score for the grading test.

Starting the CHANGELOG process.

Squash 3 more naive datetime warnings. I think the only ones left are in

dummy object creation without conditionals

added comment to make clear that leaving the variable analytics outside of the feature flag block is intentional

migrations.

Conflicts:
	common/lib/xmodule/xmodule/capa_module.py
	common/lib/xmodule/xmodule/fields.py
	common/lib/xmodule/xmodule/peer_grading_module.py
	common/lib/xmodule/xmodule/tests/test_fields.py
	requirements/edx/github.txt

Fix formatting problem in README.md 

message to explain why this merge is necessary,

Make video captions respect course author's setting.

Do a bundle install before trying to use rake, so that we have all the p...

Fix tests that vary urls.py

(cherry picked from commit 14100ba1)

(cherry picked from commit 832da3ad)

(cherry picked from commit 050846af)

(cherry picked from commit 664efb98)

(cherry picked from commit a17bf5e2)

(cherry picked from commit 273df4e1)

(cherry picked from commit c96511a2)