Added zpk creation

- Created deployment.xml (targets Zend Server 6.1 deployment package style)
- Created a post_stage script to clear caches
- Created a post_activate script that creates a marker file with current
  deployment path
- Created bin/build-package.sh
  - Creates package structure
  - Runs composer install
  - Updates deployment.xml with current HEAD sha1
  - Creates zpk
- "Fixes" .htaccess to ensure that it works in aliased environments
Merge branch 'feature/zend-server-zpk'

ZPK creation