Added Post-unit-test coverage

Re-jigged travis build file
Added coveralls script to run after build

.travis.yml

@@ -7,8 +7,12 @@ php:
   - nightly
   - hhvm
 
-install:
-  - composer self-update
-  - composer install --prefer-source
-
 script: phpunit
+
+before_script:
+  - composer self-update
+  - composer install --dev --optimize-autoloader --prefer-source
+  - mkdir -p build/logs
+
+after_script:
+  - php vendor/bin/coveralls -v