Inline underscore templates; add pre render step
Merge pull request #6268 from edx/will/simplify-template-loading

Inline underscore templates; add pre render step
Fix unit test failure due to stale urls.py
Merge pull request #6273 from edx/renzo/fix-shoppingcart-tests

Fix unit test failure due to stale urls.py
optionally using environment variable for edx-platform hash