title: Can PyYAML parse iso8601 dates?
body: <p><a href="http://yaml.org/type/timestamp.html" rel="noreferrer">According to the YAML spec, iso8601 dates with timezones should be recognised</a>. However, on trying to parse them using PyYAML 3.10 (on Windows 7 with ActivePython 2.7.2.5) I get naive dates:</p>
  
  <pre><code>In [7]: yaml.load("2001-12-14t21:59:43.10-05:00")
  Out[7]: datetime.datetime(2001, 12, 15, 2, 59, 43, 100000)
  
  In [8]: yaml.load("2001-12-14 21:59:43.10 -5")
  Out[8]: datetime.datetime(2001, 12, 15, 2, 59, 43, 100000)
  </code></pre>
  
  <p>(First format is the strict iso8601 and second is the 'relaxed' format; examples taken directly from YAML spec.)</p>
  
  <p>Is this expected behaviour, or is my PyYaml not working correctly?</p>