Remove php-pecl-xdebug provisioning from webserver state file

We're accounting for this in the devserver file, it shouldn't end up in production
Require php-fpm for php-pecl-xdebug installation
Load the xdebug module in the xdebug config
Add xdebug.ini to managed files on dev server
Clean up xdebug.ini configuration

Removes a bunch of defaults that we won't be worried with changing. Shortens the comments around the directives we do use.
Merge pull request #11 from washingtonstateuniversity/11-xdebug

Add Xdebug to the development environment