Merge pull request #2474 from edx/markhoeber/documentation/release-notes-2-5-14

Markhoeber/documentation/release notes 2 5 14
Merge pull request #2455 from edx/markhoeber/documentation/stud-1242

Doc Update for Component label in editable unit page
Clean up Mongo databases created by the test suite.
Merge pull request #2463 from edx/dcs/a11y-progress-delistify

Converted <ol> to <div> to prevent a11y confusion on course progress page.
[LMS-1727]
Add a means to skip to more specific parts of the page. Contributes to
LMS-2156
Removed inappropriate section tags. Because screen readers announce each section, they should not be used unless they are actually defining meaningful sections.
Stop using JavaScript to set the body CSS class

This prevents everything from blinking, since the CSS class will be
present when the page is rendering.
Merge pull request #2439 from edx/dcs/a11y-vivisections

Reduce the usage of <section> tags, to increase accessibility
LMS-2161
Prevent bad sequential titles

Don't try to set the title if we don't have anything in
the sequential

LMS-2168
Changes to preview to support xblocks using Locators intead of Locatins.

STUD-967
Updated bok-choy tests for a11y css selector changes
Disable broken video test
Merge pull request #2475 from edx/dcs/a11y-skip-nav

Add a means to skip to more specific parts of the page.
LMS-2156
Merge pull request #2477 from edx/diana/fix-sequence-titles

Prevent bad sequential titles
don't show the add response button if responses are not allowed.

JIRA: FOR-452
Merge pull request #2434 from edx/christina/preview_handler

preview_handler changes to support Locators
Enable (and test) xml export of pure XBlocks

[LMS-179]
[LMS-209]
[LMS-1345]
If unit display name is non-empty string, change it to a defaul (STUD-1284)
Revert "If unit display name is non-empty string, change it to a defaul (STUD-1284)"

This reverts commit b8da1c5bb78a0f3219f0d93a946402938b801b84.
Increase async script timeout in lettuce acceptance tests
Merge pull request #2479 from edx/will/update-bok-choy-for-a11y-fixes

Bok-choy fixes (a11y, video player bug)