Make options instance more dict-like.
options[key] should return a value, not an _Option instance
Replace options.as_dict() with group_dict()
stack_context deactivation support
Unnecessary import removed
Parameter is no longer necessary
Test revealing StaticFileHandler path regression.

A bisect suggests that the regression was introduced in
3f04edf5546e388293d8d1d2f015ca74f8a93217
OptionParser.group_dict() now requires a group. Add as_dict().
Merge pull request #789 from ajdavis/opts-enhancements

Make options instance more dict-like.
fixed bugs
Fix a dangling doc reference, and add a doc check to tox and travis.
Actually install sphinx on travis; fix directory reference.
$TMPDIR isn't set on travis-ci.
Fix regression in async prepare: don't continue of prepare called finish.
Backport changes from ssl.match_hostname in Python 3.3.

Includes two commits:
* Fix potential CPU DoS via abusive wildcard pattern
  http://hg.python.org/cpython/rev/fafd33db6ff6
* Fall back to common name when SAN doesn't contain any DNS names
  http://hg.python.org/cpython/rev/1b37827984ba

Closes #799.
Add py27-docs to tox envlist.
Revert change to use time.strftime (from 3.0).

time.strftime is influenced by the user's locale (if one is set with
locale.setlocale), so it's not what we want.  Go back to the (slower)
email.utils functions.

Fixes #800.
Improve error messages bytes/unicode conversion functions.
Add a test for digest auth in curl_httpclient.

I wrote this to test for a file descriptor bug, but can't reproduce it
on my system.
Use remove and add instead of update_handler in curl_httpclient.

Curl sometimes fails to tell us that it has closed a socket
and reopened a new one with the same file descriptor, leading
to problems in some IOLoops.  This should fix the recurring problem
of update_handler errors in various less-common use cases.

Closes #801.
Closes #538.