Make staff view work w/ pure xblocks (that only have a descriptor system)
Also clean up the 3rd-party po files.
Generate now removes format flags.
Add test of local_resource_url in AcidBlock
Add tests of more scopes in student_view
Mark xblock initialization status using css class (in part to make testing easier)
Remove doc-ready tests, which were flaky
Updated po/mo files without format flags.
Merge pull request #2707 from edx/ned/clean-up-i18n-tools

Ned/clean up i18n tools
Update Zooming Image doc to reference file on files.edx.org
Ignore all my probs
Merge pull request #2720 from edx/sarina/ignore-probs

Ignore all my probs
Typo corrections
Merge pull request #2722 from edx/sylvia/documentation/BLD-847

Update Zooming Image doc to reference file on files.edx.org
Merge pull request #2603 from cpennington/xblock-acid-resources-test

Add tests of local_resource_url
splash-url-exclusion: Exclude '/heartbeat' from redirect

Update the dependency to load this commit:
https://github.com/edx-solutions/django-splash/commit/6e8bd685214aebe78d0cfdf5572e27c5f1bc357a

Which allows to prevent `/heartbeat` from being redirected, which is
necessary on production servers