Feature/unix time

-Adds a helper to convert from our calendar-str format to a unix time http://en.wikipedia.org/wiki/Unix_time

-Add cljs-time helpers for converting from unix-time to cljs-time DateTime instances, as well as formatting, extracting days/months/years, and helpers to test if a given date is in the future or past, or if a date range is currently in the present (happening?).

-Properly format the namespace
in fact, I think cljs-time provides protocls for this, yeah? if you can't extend one of those directly, let's make a new one for all of these.