Moved Studio images from img/ directory to images/ directory

OPEN-304
Improve compatibility with additional mysql installations.

Some mysql debian packages do not grant mysql user as many permissions, and
we need to add them.
Merge pull request #5943 from edx/benp/db-cache-mysql56

Improve compatibility with additional mysql installations.
Enable cross-modulestore copying of course asset metadata.
https://openedx.atlassian.net/browse/PLAT-38
Adding new Google Analytics eCommerce event to shoppingcart.

Adding new event and test

pylint and comments
Merge pull request #5940 from edx/jeskew/mixed_copy_assets_between_modulestores

One bok_choy video test is failing - but it passes locally and should be fine.
Don't use 'test' db for mysql since it's reserved.

This db name is reserved and used by mysql installations. This can cause
conflicts when trying to populate our own 'test' database on mysql.
Add created_on and created_by to asset metadata storage.
https://openedx.atlassian.net/browse/PLAT-278
Merge pull request #5946 from edx/sanchez/ecommerce_info_to_ga

Adding new Google Analytics eCommerce event to shoppingcart.
Fix the DJFS dependency.
MA-90 Update Analytics Shim to match new mobile requirements.
Merge pull request #5954 from edx/benp/mysql56-test-updates

Don't use 'test' db for mysql since it's reserved.
Merge pull request #5953 from edx/jeskew/created_by_on_addition

Add created_on and created_by to asset metadata storage.
Always create an asset metadata collection in the Mongo modulestore.
If no collection name is specified, use a default name.
https://openedx.atlassian.net/browse/PLAT-294
Merge pull request #5955 from edx/sanchez/fix-djfs-dependency

Fix the DJFS dependency.
Consistently name edX branded elements within the LMS [OPEN-300]
Translate "Powered by Open edX" string
Merge pull request #5941 from edx/studio-images

Moved Studio images from img/ directory to images/ directory
disable "go to payment button" on click (ECOM-643)
Merge pull request #5957 from edx/adam/disable-purchase-button-on-click

disable "go to payment button" on click (ECOM-643)