fix Figaro calling problem

should use `Figaro.env.FOO`, instead of `Figaro.env['FOO']`
fix uploaded image width problem

auto scaling image based on container size
tweak configuration
increase nginx server_names_hash_bucket_size
paginate empty dataset for active cache

fix #37
add CentOS 6.4 autoconf script
use bootstrap-sass to replace less-rails-bootstrap gem
clean up css files
rewrite i_theme to SCSS
rename heroku deploy script
bump version to 1.5.2