providers/mailgun: return domain response instead of domain

see also https://github.com/pearkes/mailgun/commit/5b02e7e9ffee9869f81393e80db138f6ff726260
providers/mailgun: save domain records
update changelog
website: add mailgun record docs
providers/mailgun: remove dedebugging
terraform: depends_on with count creates proper graph [GH-244]
website: update docs for new mappings format
fmt
helper/schema: test cases around unknown variable values
core: check sets for computed [GH-247]
providers/aws: route53 record destroy in parallel works
v0.2.1
scripts: make bin/ dir
Install other stuff in Vagrant to cut releases
website: up version for deploy
up version for dev
Fix typo, proviate_ip -> private_ip
Merge pull request #251 from jmartelletti/fix-typo

website: Fix typo, proviate_ip -> private_ip
fix associate_public_ip_address parameter name
Merge pull request #262 from shin1x1/master

Typo: associate_public_ip_address parameter name in resource_aws_instance.go