Releases for JavaScript Libraries Manager

* Issue #2126675 by psynaptic: Switched from using hook_init() to add the assets to hook_preprocess_html() to avoid adding assets to callbacks that are outside of the page-scope.
* Issue #2013665 by psynaptic: The jslib-switch-url drush command should return an exit code on failure.

Changes since 7.x-1.0:

• #1561496 more robust local cache behavior, and tests to verify it
• #1561496 fix for bad default success variable, improve tests

Changes since 7.x-1.0-rc5:

• #1473626 by pwolanin: Force refresh if JS libraries is updated via drush
• #1404206 by ksenzee, msonnabaum: Add support for cacheable blocks via script loader

Changes since 7.x-1.0-rc3:

• #1423370: JavaScript libraries aren't loaded on some 403 pages or on "admin" pages that really aren't for admins

Changes since 7.x-1.0-rc2:

Add UI polish, add configuration link, cleanup help text.