gem skeleton generated with gemmy

This provides a syntax somewhat similar to Javascript's shorthand for constructing hashes.

This code is copied from a stack overflow answer authored by user akuhn:

http://stackoverflow.com/a/41456114/2981429

---

Usage:

1. gem 'keyword_hash_builder'

2. require 'keyword_hash_builder'

3. load patch in one of two ways:

   1. globally

      KeywordHashBuilder.load_globally
      

   2. refinement

      # in a class / module definition
      using KeywordHashBuilder.patch
      

4. Use this syntax:

   a = 1
   b = 2
   c = String
   puts `a,b,c`
   # => { a: 1, b: 2, c: String }