Parse landscape tool output too

[nitrocode]

Sort of related to this issue #20

Coinbase has a great tool called landscape and makes the plan output a lot easier to read. It would be nice to be able to do something like this.

terraform plan | landscape | terraform-plan-parser

It currently fails with this message

{
  "errors":[{
    "code": "UNABLE_TO_FIND_STARTING_POSITION_WITHIN_STDOUT",
    "message": "Did not find magic starting string: \nTerraform will perform the following actions:\n"
  }],
  "changedResources":[],
  "changedDataSources":[]
}