Comment out Gittip link on gem pages

We don't yet have the landing pages on the Gittip side needed to support
the level of indirection to show Gittip accounts associated with a Ruby
gem:

    https://github.com/gittip/www.gittip.com/issues/1591

This comments out the link from gem pages for now. The link from
profile pages on Rubygems to Gittip is fine.
Update i18n dependency to version 0.6.9
Update puma dependency to version 2.7.0
Update geminabox url
Merge pull request #631 from elgalu/patch-1

Update geminabox url
Update newrelic_rpm dependency to version 3.7.0.177
Update puma dependency to version 2.7.1
Remove today counters and graphs
Downgrade fog and excon to fix S3 communication issues
Merge branch 'master' of github.com:rubygems/rubygems.org
Fix link to Travis CI in README.md

Seems like the old link with the anchor is not working.

The correct link is https://travis-ci.org/rubygems/rubygems.org
Merge pull request #632 from claudiob/patch-1

Fix link to Travis CI in README.md
Keep a consistent sans-serif font

This pull request is very font-nerdy :books: but here it goes.

One line of CSS specifies that Arial should be used over Helvetica, when possible. The other line of CSS specifies that Helvetica should be used over Arial, when possible. For visual consistency, the two lines should be the same.

And indeed, there is no need to specify either of those options, since `font-family: sans-serif` [already makes that choice for you](http://css-tricks.com/sans-serif), defaulting to Helvetica on Mac (where it's available) and to Arial on Windows.
Merge pull request #633 from claudiob/patch-2

Keep a consistent sans-serif font
Fix tests to reflect removal of download graphs

See ea0b13629f7c926637f8d819088f727dd9fcdd9e.
Pull the rubygems version from the gem db
Fix contribution guidelines link in README

It was pointing to the wiki and the wiki in turn points to CONTRIBUTING.md.
Merge pull request #640 from fphilipe/patch-1

Fix contribution guidelines link in README
Merge pull request #612 from whit537/unlink-gittip

Comment out Gittip link on gem pages
deploy via capistrano!