added definition of allow_from to proxy configuration
made it so that certain required modules are always loaded, but only conditionally loading the rest based on the use case.  The "parameter" name kinda sucks, but it doesnt require a usage change for anyone.
Adding support for mod_dav_svn

This module provides support in apache for Subversion.
Adding rspec tests for dav_svn
Merge pull request #203 from gregswift/master

Unable to use proxy because of the default deny all
Adding `apache::mod::dav` include for #199
Merge pull request #214 from hunner/mod_dav_svn

Adding support for mod_dav_svn