Initial import
Add documentation style draft

Taken from http://dougblack.io/words/a-restful-micro-framework-in-go.html
Update API reference documentation

* add CANVAS_APP_INSTALLS
* add MOBILE_APP_ENGAGEMENT
* add POST_ENGAGEMENT
* add WEBSITE_CLICKS
* add WEBSITE_CONVERSIONS
* add Sign in API
Remove useless file
Update sign up response body
changed layout; added description to Campaign and Users API
added careers
added CNAME, careers
merge api-docs