Hold the Interactions backgrounds for later
Hide blocks if their content is blank
Tightening margins for Interactions theme
Ensure lightbox resizes check both maxw and maxh.

Cleaning up a detail for [#53567745].

https://www.pivotaltracker.com/story/show/53567745
Revert "Put close button on the left for color box"

This reverts commit 7144736cc781f59d40b0a32ef70531f1996e0701.
Hide and restore "saving" box to keep close button on right.

Moving the close button to the left was undesirable from a UI standpoint, so instead we're setting it to "display: none" when we open the lightbox, then restoring the setting when we close the lightbox. [#53567745]

https://www.pivotaltracker.com/story/show/53567745
Give activity titles even more space [#60007192]

Also, catches RITES up with theme changes made for Interactions.

https://www.pivotaltracker.com/story/show/60007192
Allow introduction to use full width [#59367158]

https://www.pivotaltracker.com/story/show/59367158
Reduce vertical spacing between embeddables in HAS

This also incorporates a bunch of vertical-space-compression steps taken for Interactions and RITES. First iteration; we may see some further iteration. [#59366098]

https://www.pivotaltracker.com/story/show/59366098
Deal with alignment of sequence titles in themes.

[#59364378] This was originally done in Interactions, now it's in HAS and RITES as well.

https://www.pivotaltracker.com/story/show/59364378
Allow for width of HAS logo [#59364378]

https://www.pivotaltracker.com/story/show/59364378
More left/right space around introduction for HAS

[#59367158]

https://www.pivotaltracker.com/story/show/59367158
Remove limit on length of activity titles [#60013900]

https://www.pivotaltracker.com/story/show/60013900
INDEX ALL THE THINGS
Less space between the last embeddable and next/prev.

[#59366098]

https://www.pivotaltracker.com/story/show/59366098
Merge branch 'refs/heads/master' into production