use bright style for header
bump version to 1.5.0.alpha
use 'rabel-meta' gem to track downloads

and use puma in development environment
only support Rabel default theme
fix deploy script

we should use `rvm use 1.9.3-p327 --default` to set default ruby version
update unicorn config

don't listen on port 3000
configure rabel via environment variables
move env config to `.env` so foreman can read them
update gems
use memcached server in production
don't connect to db when precompiling assets

fix deployment problem on heroku
update README
add host and port config to database config
support custom logo
use jquery-ui-rails gem
use foreman/thin in development
release version 1.5