This should make the module .load files symlinks from /etc/apache2/mods_available

...but will break the .conf files. Will fix that next.
Changed the .conf File resources so the have the same format as .load files in all the module classes.

When using a Debian OS, if  a .conf file has been defined in a module class, apache::mod will symlink it into /etc/apache2/mods-enabled
Move $mod_enable_dir parameter to the base class and update proxy_html mod
Update specs for mod load symlinks on debian
Merge pull request #16 from hunner/sym_link_mods

Sym link mods