remove old chef stuff
return latest prerelease version if there are no release versions available
Fix sorting of Rubygem#public_version

This is a rebase of PR#307, closes #700.
Order explicitly by versions.position
Merge pull request #703 from strzibny/fix-sorting

Fix sorting of Rubygem#public_version
Update nokogiri to version 1.6.3.1
Update high_voltage to version 2.2.1
Update cucumber to version 1.3.16
Update newrelic_rpm to version 3.9.1.236
Update ruby version to 2.0.0-p481.
Merge pull request #706 from knappe/master

Update ruby version to 2.0.0-p481.
use database_rewinder instead of database_cleaner
Update versions for rubygem and ruby.
Drop distinction between mysql and mysql2

The `mysql` gem has been deprecated in favor of the `mysql2` gem.  At this point, we shouldn't make a distinction and just point people to the `mysql2` gem.

This also removes a warning about MySQL in Snow Leopard, which included a typo that has been there for about a year.  Given the length of time the typo existed, I would say we're in the clear to remove the entire warning.
Merge pull request #707 from knappe/patch-2

Update versions of rubygem and ruby.
Merge pull request #708 from knappe/patch-3

Drop distinction between mysql and mysql2
Merge pull request #709 from mcfiredrill/database-rewinder

use database_rewinder instead of database_cleaner
Hide yanked gems on author's profile.

Fixes #677
Merge pull request #705 from Elffers/yanked

Hide yanked gems on author's profile.
add Runscope sponsor link