universe should return opscode location type

Chef plans to redirect the cookbooks/community site URIs to
supermarket in order to facilitate the launch. Currently, returning
"supermarket" as the location type means that berkshelf (the client)
cannot download cookbooks from supermarket.

This change sets the location type to opscode by defining a new
constant, which can be updated at at later point if/when necessary.
download_path should return an "opscode" URI

The right thing to do here is what feels like the wrong thing: in
order to make supermarket compatible with the old community site so
that api.berkshelf.com continues to work seamlessly, not only do we
need opscode as the location_type, but the location_path for the
cookbook needs to match the same URI that was returned for the
community site. This is used by the CommunityREST class in Berkshelf
for the "opscode" type. At a future date if "supermarket" becomes the
location_type, then we'll update the location_path to match and
probably return to the previous path that looked like this:

/api/v1/cookbooks/redis/versions/1.2.0/download

While the `download_path` method doesn't use the arguments `cookbook`
or `version` in this implementation, I left them there so we have a
minimal code change in the future to revert this, without breaking the
method.

Finally, as the comment states, to ensure we don't have an empty port,
we only preprend the colon if needed based on whether port has a
value. It should be an empty string and not nil (otherwise fetch would
raise a KeyError exception, but it's possible someone didn't use the
supermarket cookbook that populates the ENV variables with the .env
file.

Also, fix the specs broken by 8aa5659
Add a timed spec for universe

Per @sethvargo's recommendation
Fix specs broken by #eda127b

We don't need the spec that checks for route compliance for this
particular method since we're not generating a full route.

Convert the port to a string before checking if it's empty. We could
use #blank? here, but @jtimberman avoids using ActiveSupport in order
to not develop habits that might leak into cookbook code.
Expect the proper string for berks

Berkshelf's `CommunityREST` expects a particular string, so we use
`#eql` to check that `download_path` generates the right thing with
various options. We also want to make sure if a port and protocol
isn't specified, we get the right thing (`http` by default, and no `:`
w/ an empty port string).
:routes is no longer used in this spec
ensure the port is nil, as that's what we test
squelch rubocop warnings that made the build fail
Build nokogiri with system libraries on Travis
Merge pull request #520 from opscode/jtimberman/supermarket-location-is-opscode

universe should return opscode location type
Enable and test other GHFM features

Enable and test other GitHub Flavored Markdown features in Redcarpet.
Merge pull request #525 from opscode/ghfm

Enable and test other GHFM features
Merge pull request #529 from opscode/nokogiri-travis

Build nokogiri with system libraries on Travis
Fixes #537 - Upgrade Rails wrt CVE-2014-3482

It was determined that supermarket is *not vulnerable* to this
vulnerability. However, we should upgrade to the latest version of
Rails, for posterity's sake.

CHEF posted about the vulnerability on our blog:

* http://www.getchef.com/blog/2014/07/02/chef-rails-cve-2014-3482/
Merge pull request #538 from opscode/jtimberman/CVE-2014-3482

Fixes #537 - Upgrade Rails wrt CVE-2014-3482
Fixes #536 - add download_url to /universe

When retrieving the universe from supermarket, it should contain
`download_url` - the full URL for downloading the cookbook. This
restores the full URL from `location_path` prior to PR #520, while
maintaining compatibility with berkshelf.

* implement download_url data for /universe
  - renames #download_path to #location_path
  - add #download_url method and constant
  - add #protocol_host_port method as it will be used by #download_url
    and #location_path
* use example.com like the RFC suggests; we dont own narf.com :)
allow admins to combine and delete CCLAs
adding a search scope to CclaSignature
refactor the combine! method
Style organization management view

Write some copy and style organization management view.