Fix a typo

It should be "a horrible", not "an horrible". There are some examples: http://www.merriam-webster.com/dictionary/horrible .
Adds the code climate badge to README
Merge pull request #57 from DNNX/patch-1

Fix a typo
Merge pull request #58 from MattMSumner/master

Adds the code climate badge to README
Merge pull request #1 from weppos/master

merge master from weppos master