Add constant values to a CloudFormation template

[ericzbeard]

Closes #156

Parameters:
  Prefix:
    Type: String

Rain:
  Constants:
    Test1: ezbeard-rain-test-constants
    Test2: !Sub ${Prefix}-${Rain::Test1}-SubTest

Resources:
  Bucket:
    Type: AWS::S3::Bucket
    Properties:
      BucketName: !Rain::Constant Test1

  Bucket2:
    Type: AWS::S3::Bucket
    Properties:
      BucketName: !Rain::Constant Test2

  Bucket3:
    Type: AWS::S3::Bucket
    Properties:
      BucketName: !Sub "pre-${Prefix}-${Rain::Test1}-suffix" 

Running rain pkg on this template produces:

Parameters:
  Prefix:
    Type: String

Resources:
  Bucket:
    Type: AWS::S3::Bucket
    Properties:
      BucketName: ezbeard-rain-test-constants

  Bucket2:
    Type: AWS::S3::Bucket
    Properties:
      BucketName: !Sub ${Prefix}-ezbeard-rain-test-constants-SubTest

  Bucket3:
    Type: AWS::S3::Bucket
    Properties:
      BucketName: !Sub "pre-${Prefix}-ezbeard-rain-test-constants-suffix"