Pair of bugfixes that have made me grumpy.

Git add . instead of * .gitignore; use the SSH instead of the HTTPS origin address for github.
Note about what Emerson does
Ad details to several default tickets
Add link to twitter card validator
Add copy editing default ticket
Split copy desk ticket into two
Homepage ticket. Closes #255.
Merge branch 'master' of https://github.com/nprapps/app-template into copy2
Add files missing from gitignore.
Kill copyrighted images from repo.
Merge master.