Allow passing a block to post, get, put, and delete methods.
Remove respond_to definitions, contingent on unsupported Ruby versions
Add required_ruby_version to the gemspec
Merge pull request #31 from code42/remove_respond_to

Remove respond_to definitions, contingent on unsupported Ruby versions
Merge branch 'master' of https://github.com/code42/code42_api_ruby into qa_calls

Conflicts:
	lib/code42/connection.rb