Fix paver python prereq paths
i18n: Make values that has 'display_name' be displayed localized in editor

Dictionary values like Boolean, or some other value types which has 'display_name' can now be displayed with the localized version.
Get rid of skiptests
Split mongo correctly serializes and deserialized references
STUD-1592, STUD-1603, LMS-2642
Add tests for has_course
and negative tests for get_course.
Fixed change log table format & pdf errors
Merge pull request #3875 from louyihua/translation-fix

i18n: Make values that has 'display_name' be displayed localized in editor
Merge pull request #3903 from edx/ahodges/documentation/data_chg_log

Fixed change log table format & pdf errors
Merge pull request #3487 from edx/ammar/fix-paver-python-prereq-paths

Fix paver python prereq paths
Merge pull request #3901 from edx/dhm/opaque-dont-skip

Dhm/opaque dont skip
Merge pull request #3900 from edx/dhm/test_has_course

Add tests for has_course
Puts course listings in a sane order