(packaging) Add dependency on ruby-rgen to gems, debs, and rpms.
(packaging) Add raring to the default cows list

Raring will be released near the end of April, so this commit adds it to the
list of cows to build against.
(packaging) Remove f16 from mocks to build as it is EOL

Fedora 16 went EOL 02-12-2013, so this commit removes it from the mocks to be
built against.
Merge pull request #1596 from haus/add_rgen_depends

(packaging) Add dependency on ruby-rgen to gems, debs, and rpms.
Merge pull request #1598 from haus/update_cows_and_mocks

Update cows and mocks
Docs: Explain HTTP header name munging in ssl_client_header and ssl_client_verify_header

The way these settings map to actual HTTP header names isn't transparent, so
this commit explains how they map.
Merge branch 'nfagerlund-header_munging_description'

* nfagerlund-header_munging_description:
  Docs: Explain HTTP header name munging in ssl_client_header and ssl_client_verify_header

[ci skip]
closes #1597