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
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.
Merge remote-tracking branch 'wolever/fix-staticfile-serving' into merge

Conflicts:
	tornado/test/web_test.py
Avoid references to self.settings in StaticFileHandler instance methods.

This fixes support for secondary StaticFileHandlers configured separately
from the default static_path.

Changed the interfaces of some new-to-3.1 methods to avoid passing in
settings to class methods used in both class and instance contexts.

Closes #796.
Re-add a missing abspath call.

This is needed when __file__ is not absolute.
Remove a seemingly unneded timeout that made this test timing-sensitive.
Update release notes
Organize release notes by module
Merge remote-tracking branch 'mrjoes/master' into merge
Add a stack_context benchmark.
Fix an exception when the outermost stack_context is deactivated.

Add more tests for deactivation in various scenarios.
Use py26-compatible syntax in tests.
Add check in case parsedate failed.

email.utils.parsedate returns None if failed to parse date, add a check
to handle that.
Merge pull request #805 from chinyue/master

Add check in case email.utils.parsedate failed
Add an overridable attribute FacebookGraphMixin._FACEBOOK_BASE_URL.

Closes #241.