parameter: change generic parameter details.
fn: implement Fn::Base64.
resource: implement WaitCondition and WaitConditionHandle.
implement Fn::FindInMap.
ec2: add legacy instance types.
ec2: cidr ips can be refs.
ec2: allow specifying instance type as a param.
resource: misc API improvements to AWS::EC2::Instance.
allow resources to specify upstream deps.
resource: static API for WaitConditionHandle.
test: first lengthy test (LAMP stack).