Add travis and coveralls badges

Author: weierophinney

README.md

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 Api-Problem: ZF2 Module for API-Problem representations
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+[![Build Status](https://travis-ci.org/zfcampus/zf-api-problem.png)](https://travis-ci.org/zfcampus/zf-api-problem)
+[![Coverage Status](https://coveralls.io/repos/zfcampus/zf-api-problem/badge.png?branch=master)](https://coveralls.io/r/zfcampus/zf-api-problem)
+
 This module provides data structures and rendering for the API-Problem format.
 
 - [Problem API](http://tools.ietf.org/html/draft-nottingham-http-problem-05),