Change documentation and examples to reflect filename change

src/bindings/ruby/README.md

@@ -50,7 +50,7 @@ Add hammer to your Gemfile.
 
 Use hammer in your project.
 
-  `require 'hammer'`
+  `require 'hammer-parser'`
 
 ### Building a parser
 

src/bindings/ruby/lib/hammer-parser.rb

@@ -2,11 +2,6 @@ require 'hammer/internal'
 require 'hammer/parser'
 require 'hammer/parser_builder'
 
-# TODO:
-# Probably need to rename this file to 'hammer-parser.rb', so
-# people can use "require 'hammer-parser'" in their code.
-
-
 # Leave this in for now to be able to play around with HParseResult in irb.
 x = nil
 parser = Hammer::Parser.build {