Add coveralls.

Author: nqxcode

.coveralls.yml

@@ -0,0 +1 @@
+service_name: travis-ci

.travis.yml

@@ -6,8 +6,25 @@ php:
   - 5.6
   - hhvm
 
+env:
+  global:
+    - setup=stable
+    - coverage=no
+
 before_script:
-  - composer self-update
-  - composer install --prefer-source --no-interaction --dev
+  - travis_retry composer self-update
+  - composer config discard-changes true
+  - if [[ $setup = 'stable' ]]; then travis_retry composer update --prefer-source --no-interaction --prefer-stable; fi
+  - if [[ $setup = 'coveralls' ]]; then travis_retry composer require "psr/log=1.0.0" "satooshi/php-coveralls=~0.6" "symfony/yaml=~2.0" --prefer-source --no-interaction --dev; fi
+
+script:
+  - if [[ $coverage = 'yes' ]]; then phpunit -c phpunit.xml --coverage-clover build/logs/clover.xml; fi
+  - if [[ $coverage = 'no' ]]; then phpunit -c phpunit.xml; fi
+
+after_script:
+  - if [[ $setup = 'coveralls' ]]; then php vendor/bin/coveralls -v; fi
 
-script: phpunit
+matrix:
+  include:
+    - php: 5.5
+      env: setup=coveralls coverage=yes