port coffeescript to javascript

there is actually no need for cs at this time.
no complexity or pasta code where cs could help.
move exports to the bottom
use charmap export instead of own ref
lazy require symbols table
Allow slug to be used as an AMD module, as well as in-browser
preload symbols table on nodejs
allow to disable symbols
more to the remove list
test unicode symbols
store default values in an object
disable auto loading symbols table in browser
bump version