add index covering api v3 basics
added heroku docs link
Merge branch 'develop' into template_engine
Remove sentence
Merge pull request #403 from sendgrid/pj-partnerdocs

added heroku docs link
Merge pull request #404 from anishaingram/patch-3

Remove sentence
template engine API reference docs
v3 api example plugin
first crack at template engine docs
fix order of subfolders
merge upstream
update weight of template engine docs
update icomoon
add setup guide
Fixed small spelling mistake.
minor tweaks
optimize pngs
change page weights
fix incorrect use of authentication where authorization was meant
make homepage panel css more specific; convert apiv3 example containers to panels