add date utility to parse some common formats
extract DataSiftResult into an interface and provide a default implementation
replace dates with strings until the up is updated
adds support for pull

Adds support for Pull’s
JSON_META
and NEW_LINE output types.
JSON_ARRAY is not yet supported due to a bug.
See the examples in the test folder for usage.
It is recommended that the take() approach demonstrated is used.
Otherwise you must manually perform all status checks, stopping and
unsubscriptions