Setup db only when db not exists
Install Carton when exec setup, only if carton command is not found
copy development config automatically, if config/development.pl doesn't exist
execute 'carton install' in script/setup.sh
fix docs about carton
fix README.md to describe OAuth setting
add requirements for a Twitter OAuth Application
Fix README
Merge pull request #41 from CPAN-API/easy-setup

Setup local development environment easily