ruby関連など色々インストール

mercurialはeasy_installから入れた方が調子よいので、aptを消す

sudo apt-get remove mercurial

sudo apt-get install python-dev python            
wget http://peak.telecommunity.com/dist/ez_setup.py 
sudo python ez_setup.py 
sudo easy_install -U mercurial
sudo easy_install -U hgsvn

rubygemsまわり

sudo apt-get install gcc g++ make
sudo apt-get install rubygems

sudo gem install rails --include-dependencies
sudo apt-get install libdbd-sqlite3-ruby libsqlite3-ruby libsqlite3-dev sqlite3 ruby1.8-dev rake
sudo gem install rake
sudo gem install sqlite3-ruby
sudo gem install Twitter