* Add secondary CIDR block support using a local variable to derive the vpc id to ensure the CIDR block operations are applied before the CIDR operations
* Add secondary cidr block outputs to module output
* Add the wonderful examples from matthiasr's PR located at https://github.com/terraform-aws-modules/terraform-aws-vpc/pull/162 all credit goes to them for this wonderful example
* From copy and paste accidentally used variable name that differed from these variables
* Resolve typo in secondary_cidr_blocks
* Fixed README formatting
* Followups for #161
* Added local.vpc_id with description