0.6 22oct2014
* added format_utc option

0.5 22oct2014
* added format option
* do not retry auth failures

0.4 14oct2014
* fixed binding option
* added unit_system option

0.3 22sep2014
* fixed bug that resulted in triple tweets

0.2 22sep2014
* ensure proper behavior when some observations do not exist
* improve formatting to stay under 140 character limit
* fixed trivial coding mistakes in the 0.1 release

0.1 21sep2014
* initial release
