Merge branch 'master' into release

Conflicts:
	README.rst
Make story titles left-aligned on homepage. Tweak size, line spacing, and margin of homepage header. (#433)
Merge branch 'develop' of https://github.com/PitonFoundation/atlas into 433-homepage-redesign
Fix uneven number of columns in the story list
Order "My Stories" list by last edited date

Order the "My Stories" list by reverse chronological date of last edit.

Closes #549
Add style for disabled buttons

Sets opacity to 65% for buttons and pseudo-buttons (elements with the
.button class) with the disabled attribute set (or .disabled set in the
case of psuedo-buttons).

Closes #516
On homepage, move news item title & byline above image. Addresses #588.
Light border around images in latest items lists on homepage. Addresses #586.
Fix: orange pills follow active item in homepage supporting foundation slider/list.
Auto-cycle homepage header slider, with hover on pause enabled. Also remove some obsolete JS that addressed previous homepage design. Addresses #584.
Update homepage links to stories, organizations and projects. Add images, copy, and update styling. Addresses #573.
Return homepage header font size to its former 36px glory. Addresses #433.
Truncate non-news featured item excerpts

Truncate non-news featured items to 75 words.  I opted not to include a
"Read more" link because that would be redundant to the title and image
links.  Also, it's messy to check whether the text has been truncated or
not at the template layer and show the link conditionally.

Closes #589
Make homepage images for links to stories, projects, and orgs slightly smaller.
Pull from piton/develop. Fix merge conflict in featured_object template.
Make images on homepage list of stories, projects, and orgs slightly smaller, again. (#573)
Added "View this X" link to featured item

Addresses #433
Added "View this X" link to featured item

Addresses #433, #573
Merge branch 'develop' of github.com:PitonFoundation/atlas into develop
remove special styling on .more links ... we can revisit link semantics later but for now we should aim towards normalizing things.