Replaces debug with phpdbg for faster test coverage report generation.

Author: dsposito

.travis.yml

@@ -13,11 +13,12 @@ install:
 before_script:
   - composer self-update
   - composer install --dev --no-interaction
+  - phpenv config-rm xdebug.ini
   - mkdir -p build/logs
 
 # Run tests and generate test coverage report.
 script:
-  - phpunit -d api_key=$API_KEY --coverage-clover build/logs/clover.xml
+  - phpdbg -qrr phpunit -d api_key=$API_KEY --coverage-clover build/logs/clover.xml
 
 # Submit test coverage report to Coveralls.
 after_success: