Git ignore Gemfile.lock

[davidmiller11]

Why?

• Gemfile.lock does not need to be included in gem development, and was preventing the use of rake release bundler task.

How?

• Remove from git index cache
• Add to .gitignore

[davidmiller11]

Some add'l reference here -> http://yehudakatz.com/2010/12/16/clarifying-the-roles-of-the-gemspec-and-gemfile/