Merge remote branch 'public/master' into periodic-merge-20130701
Merge pull request #434 from axsh/periodic-merge-20130701

Periodic merge 20130701
run gem install as part of ruby build.
update gems version.

Note for sequel gem. it does not work with 3.48.0 or later versions.
so we use 3.47.0. need to fix after_initialize() hook and the model
classes using single table inheritance plugin.
use https in Gemfiles.
use modified eventmachine from github.com/axsh/eventmachine.git.
upgrade ruby binary to p448.
git pull if ruby-build.git is available locally.
dolphin: fix Gemfile.
Merge pull request #221 from axsh/monthly-bundle-update

Monthly bundle update: 13/Jul
Revert "security-group: remove task that allow ARP to host node since default ebtable policies are ACCEPT."

This reverts commit 45ec5cceba322794a0383c2aeebdfc00b97c1d2a.
upgrade ruby binary to 2.0.0-p247.

also add quick hack for rails-3.0.x.
stop to install rake to the root gem path. Ruby 2.0 bundles it.
Merge pull request #222 from axsh/ruby-2.0

Build & Run with Ruby 2.0.
Merge pull request #446 from axsh/fix-metadata-server

Revert "security-group: remove task that allow ARP to host node since de...
ensure to use fuguta 1.0.1 or later.
remove unnecessary URI decode.
fix sinatra-contrib 1.4 compatibility issue.
Merge pull request #223 from axsh/ruby-2.0

Follow up changes to pass CI.
Merge pull request #220 from axsh/fix-dolphin-gemfile

dolphin: fix Gemfile.