implement ##cartero_dir_url
add publicDir to carteroJson
change makeUrlsAbsoluteInCssFile to use publicUrl in url()
use applyDefaultsAndNormalize for trim and comments
change the way that publicUrl is normalized, to always start with '/'
Merge branch 'dev' of https://github.com/pepoviola/cartero into pepoviola-dev
add example for publicUrl config option
publicUrl: make it an empty string by default instead of '/'
update change log and bump version number