Add ZEND_DONT_UNLOAD_MODULE and mention built-in web server
Merge branch 'add_dont_unload'

* add_dont_unload:
  Add ZEND_DONT_UNLOAD_MODULE and mention built-in web server
Merge Pull Request #5

* pull-request/5:
  Add ZEND_DONT_UNLOAD_MODULE and mention built-in web server