Release version 2.1.0

This release adds support for Apache BigTop 1.0.0 and HDP 2.3.2.0 to the cookbook.

• Add support for Apache Storm ( Issue: #223 )
• Support BigTop 1.0.0 ( Issue: #224 )
• Update minimum apt cookbook dependency ( Issue: #227 )
• Support HDP 2.3.2.0 ( Issues: #228 COOK-76 )
• Update Gemfile dependencies ( Issue: #229 )
• Init scripts should use ampersand ( Issue: #230 )
• Update foodcritic constraint ( Issue: #231 )
• Reserve Hadoop ports from being used as local ports ( Issues: #233 COOK-79 )