Add listener.ssl_certificate_id support to AWS ELB
health_check is an optional parameter for ELBs
allow vpc_zone_identifier in aws_autoscaling_group
providers/digitalocean: schema framework, validation
providers/digitalocean: convert record to schema
Merge pull request #281 from hashicorp/f-do-schema

Convert DO to partial-helper.Schema
providers/digitalocean: handle when resource deleted manually [GH-279]
providers/digitalocean: convert domain to helper/schema [GH-187]
Update CHANGELOG
fmt
providers/aws: check if instance is set on eip
providers/aws: check for non-exist on refresh
providers/aws: retry delete of eip [GH-276]
config: don't crash when there is an error parsing interpolation
[GH-282]
small typo
Merge pull request #283 from polynomial/master

website: small typo
config: unit tests for lexer
config: parse multi-args in interpolations [GH-282]
Update to 12.04 in vagrantfile for building
v0.2.2