Added codecov.io support for code coverage reporting

Author: dragonmantank

.travis.yml

@@ -9,4 +9,8 @@ php:
 before_script:
   - composer install
 
-script: ./vendor/bin/phpunit -v --configuration ./phpunit.xml.dist
+script:
+  - ./vendor/bin/phpunit -v --configuration ./phpunit.xml.dist --coverage-clover=coverage.xml
+
+after_success:
+    - bash <(curl -s https://codecov.io/bash)