wip: gulp: remove web_server task

* use sprockets
wip: bundler: use sprockets, sass, coffee-script
wip: rack: use sprockets (/js/*, /css/*)
wip: web_server: rename config.coffee => api_config.coffee
wip: web_server: add requirejs_config.coffee
wip: web_server: change script paths
wip: web_server: change backbone.localStorage path