studio - sass cleanup: adding in more color variables, proofing box-sizing and older/rougher unit scss

studio - sass cleanup: local merge with master and small comment/organization tweaks to variables and base-styles

Bug fix for Polls tool.

Have to explicitly specify safe option on mongo insert, remove, update b...

Have to explicitly specify safe option on mongo insert, remove, update because the debug toolbar specifies a default of safe=False.

Allow backwards compatibility for forums pinning UI.

Feature/cale/fix metadata inheritance

Always compute the metadata inheritance tree, even on a course module, so that when walking down the tree, we always get the right data

Feature/will/courseware lettuce tests

Fix/cdodge/add 500 404 templates to studio

Fix version handling for combined open ended

Fix/will/fix broken jasmine lms tests

Changed constant to uppercase

Skip over fields that are scoped to students when looping through the Co...

Small pylint cleanup

Skip over fields that are scoped to students when looping through the CourseModule fields in the instructor dashboard

Handle days_early_for_beta possibly being a string

XBlock SDK announcement

LMS Lighthouse [#261]

Feature/kevin/pinning patch

Content/rocha/xblocks announcement

that mongo caches are initialized for the test database.
This avoids a warning from the mongo modulestore.