At @seanherron's suggestion, adds a section on SNI.
Actually, belay that order.
At @seanherron's suggestion, added a section on API keys.
Removes versioning section, no consensus yet.
Try a slight reword
Merge pull request #34 from 18F/sni

Section on SNI
Merge pull request #35 from 18F/keys

Section on API keys
Merge pull request #27 from 18F/rewrite

Initial rewrite
Update README.md
Merge pull request #36 from LenaTrudeau/patch-1

Update README.md - grammar tweaks
Adds a date format section, recommending ISO 8601.

Closes #38.
Merge pull request #39 from 18F/date-formats

Adds a date format section, recommending ISO 8601
Merge branch 'master' of github.com:18F/api-standards into rewrite-LTB

Conflicts:
	README.md