Add listener.ssl_certificate_id support to AWS ELB
health_check is an optional parameter for ELBs
website: fix syntax of variables
Vagrantfile only needs one machine now
scripts: build script cross compiles
v0.2.0
Fix phony in Makefile
scripts: fix extension in file copy for build
scripts: quiet
scripts: fix dev build
up version for dev
Update CHANGELOG
main: auto-discover plugins [GH-190]

/cc @pearkes @armon - exe dir and pwd
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