Merge pull request #37 from haus/master

(maint) Remove raring from default cows
(RE-2129) Only use one OTHERMIRROR in pbuilderrc

Previously, when setting PE_VER to enable a PE cow, we would continue to
include the apt.puppetlabs.com repo, even though we would use none of
those packages. This commit updates the pbuilderrc to set OTHERMIRROR to
be one or the other, but never both. This has the added bonus of
negating an edge case segfault we've seen on precise-amd64 cows that
have both repos enabled.
Merge pull request #38 from haus/ticket/master/RE_2129_update_pbuilderrc

(RE-2129) Only use one OTHERMIRROR in pbuilderrc
(RE-2157) Allow override of $OTHERMIRROR by tooling

As our build tools become more diverse the complexity of the pbuilderrc
grows. In order to avoid that somewhat while allowing added flexibility
in what repos to build against, this commit adds an environment variable
which is honored by the pbuilderrc. If the packaging tooling sets
$BUILDMIRROR, that will be used as OTHERMIRROR instead of apt.pl.com or
enterprise.dl.pl.net. BUILDMIRROR can include more than one repo as long
as they are pipe separated.
Merge pull request #39 from haus/ticket/master/re_2157_allow_othermirror_override

(RE-2157) Allow override of $OTHERMIRROR by tooling
Revert "GPG module includes ruby::dev, which includes a conflicting build-essential pkg"

This reverts commit 982a9406666f076497ec22e1f34c9c3365056d49.

The gpg module no longer includes ruby::dev by default, so this should
not bring in a conflicting build-essential resource.

Conflicts:
	manifests/packages/extra.pp
(maint) Add gnupg-agent to extra packages

The gpg module no longer includes gnupg-agent, so this commit adds it
to the list of extra packages that we desire to have installed on a deb
builder.
Merge pull request #40 from haus/maint/master/add_back_gpg

(maint) Re-add gpg to extra packages
(maint) Remove quantal from default cows, it is EOL