New Resource: Augeas httpd

[jtopjian]

An augeas-based httpd resource would be very useful for managing Apache configuration files.

A cursory search on Google shows that the httpd lens may be a bit awkward to work with, so the Waffles resource might have to add some assistance -- similar to the JSON resources.

https://github.com/hercules-team/augeas/blob/master/lenses/httpd.aug