Functions for working with local time without having to shift
to/from utc, the preferred time zone of `clj-time.core`.

Get the current local time with `(local-now)`.
`(to-local-date-time obj)` returns a local date-time instance
retaining the time fields.

The following all return `1986-10-14 04:03:27.246` with the
local time zone.

  (to-local-date-time (clj-time.core/date-time 1986 10 14 4 3 27 246))
  (to-local-date-time "1986-10-14T04:03:27.246")
  (to-local-date-time "1986-10-14T04:03:27.246Z")

The dynamic var *local-formatters* contains a map of local formatters
for parsing and printing. It is initialized with all the formatters in
`clj-time.format` localized.

to-local-date-time for strings uses *local-formatters* to parse.
`(format-local-time (local-now) :basic-date-time)` formats an obj using
a formatter in `*local-formatters*` corresponding to the format-key
passed in.