Merge pull request #1506 from shalott/youtube_sanitizer

Video embed sanitizer
Issue 3952: Remove fic-centric language from gift notification email
Issue 3952: Hopefully fix tests
3237 Scarier emphasized deletion message and better time in flash message
3237 The worst part is I knew about this test and didn't fix it anyway
Issue 3034: Invitations link for non-existing user causes error 500
Issue 3034: Invitations page cucumber test
Cleaning up logic
Merge pull request #1425 from larissa/chapter-title-not-displayed

Issue 2394 - Chapter title not displayed
Merge pull request #761 from scottsds/issue_3034

Issue 3034: Invitations link for non-existing user causes error 500
Merge pull request #1577 from CristinaRO/issue-3939-filter_taggings

Issue 3939 filter taggings
Merge pull request #1578 from CristinaRO/issue-3231-wrangling

Destroy wrangling assignments when user is deleted
Merge pull request #1579 from CristinaRO/issue-2221-taggings_count-reload

Rake task to fix existing taggings_count below zero
Increase timeout limit on Capybara to minimise intermittent failures.
Increase timeout further.
Merge pull request #1574 from sarken/fixtures_update_for_seeding

Update admins.yml and users.yml to work when seeding
Merge pull request #1576 from sarken/schema_change

Change filter_taggings table creation
Merge pull request #1572 from sarken/filtertaggings_migration_comment_out

Comment out the revert filter taggings migration to stop failures
Merge pull request #1589 from sarken/issue_3237

3237 Scarier emphasized deletion message & better time in flash message
Issue 3958: add more supported languages to the Support form