ads 7.x-1.0-alpha2

Fixes for:
- Build fail for db pass containing $.
- grep -P option is not supported on BSD/OSX.
- Build fails on ads-configure and ads_setup.
- Build fails on Simpletests: General error: 2006 MySQL server has gone away.
- Don't display success message when build-drupal failed.

New features:
- Check if ads_installation_state.json is still required.
- Clone ads_drush repo into sites/all/drush via drush make.
- Add ability to select project.dir.src by phing via argument.
- If project.drupal.build.type is dev, invoke build-dev-env.xml.
- Add new variable project.drupal.build.search to build.properties config file.
- Install contrib modules in contrib dir.

Read more: https://github.com/mycognitive/ads/issues?q=milestone%3A7.x-1.0-alpha2+i...