Add atom link for single gem versions feed

Add atom builder for single gem version

Add styles for rss link

Add yield head for injecting atom feed link

Include link tag in head for rss feed

Add gem name to feed title, add test for atom feed

Use ruby stdlib iso8601 method instead of hand formatted

Refactor individual and all versions feeds to share some builder partial
Fix server path configuration in development

This fixes path problems when setting up a local
development environment. In dev, Fog uses the 
local storage provider and Indexer assumes all
operations will result in files being written 
to `Pusher.server_path + "/gems"`. With Fog in the
mix, this actually becomes `Pusher.server_path +
s3_bucket + "/gems"`. (`Pusher.server_path` 
defaults to the `server` directory.)

Removing the s3_bucket name from `rubygems.yml`
and the `'gems'` from `Indexer#fog` means that 
gems and index updates are served out of the
`Pusher.server_path` as expected.

No tests for this as the behavior only occurs in
the development environment.
Fix `gemcutter:index:update` rake task

`Pusher#upload` was extracted out into `Indexer`
in a802782c. This updates the index rake task
to use `Indexer.new.perform` instead of the
individual upload steps. Stats get lost but the
upshot is the task works again. Hooray!
Merge pull request #494 from elskwid/local-dev

Local development fixes
Merge pull request #479 from amateurhuman/466-per-gem-rss-feed

Add per gem rss feed
Updates Mailing List Url

Changes the mailing list url to pint to rubygems-org and not gemcutter
since the mailing list was renamed.
Update jquery-rails dependency to version 2.1.4
Use new capybara selector syntax
Update librato-metrics dependency to version 0.7.5
Update sprockets dependency to version 2.2.2
Update timecop dependency to version 0.5.4
Update libwebsocket dependency to version 0.1.7.1
Update multi_json dependency to version 1.4.0
Update fog dependency to version 1.8.0
Update MIT-LICENSE going into the new year

Wow, this hasn't been done in a while.
hide Licenses box when a Rubygem has no licenses

addresses Issue #496
Merge pull request #497 from mattgillooly/issue_496_hide_licenses_box

hide Licenses box when a Rubygem has no licenses
Update newrelic_rpm dependency to version 3.5.3.24
Update newrelic_rpm dependency to version 3.5.3.25
Update selenium-webdriver dependency to version 2.27.0