minor cut and paste typos on methods
when we get an error from Route53, raise an exception
* reworked connection 'if not' to work with Python 3.x.
* fixed util.py which tried to parse times handed back from AWS's API that
  didn't contain microseconds.
* added quick test for parse_iso_8601_time_str
Merge pull request #4 from cd34/master

Minor fixes: doc markup cut and paste fixes, added a raise when an error is received from AWS's API