Adding support for previewing a node flip change before its made so you can see what cookbooks are different (and what versions) in the environment you are about to flip to
Putting in a git ignore, should be relatively safe patterns

Adding in colorize gem requirement for cleaner output

Fix to make preview work on both chef 10 and chef 11

Making the output clearer with regards to what the environment switch will do
Merge pull request #5 from etsy/master

Adding preview of flip showing what cookbooks and versions will be applied by flipping to new env