Add Code Climate code coverage, close #15

commit 9072879009509e8bb98db152d2d36d68b2d4b75f
Author: Jan Vlnas <git@jan.vlnas.cz>
Date:   Fri May 2 02:42:57 2014 +0200

    WebMock: add exception for codeclimate.com

commit 0850709e3771d9fbf769ac1b1ff9fe7f5565aaac
Author: Jan Vlnas <git@jan.vlnas.cz>
Date:   Fri May 2 01:57:37 2014 +0200

    Setup Code Climate #15