Adding missing text for PYTHON SOFTWARE FOUNDATION LICENSE VERSION 2
Merge pull request #1 from pombredanne/license

Adding missing text for PYTHON SOFTWARE FOUNDATION LICENSE VERSION 2
Updating ChangingLog.
Converting unicode test from using u''.
check_key disabling and performance improvements.

   *  Client() now takes a "check_key" option, which defaults to True.
      If False, it disables the checking of keys to ensure they have
      acceptable size and are composed of non-control characters.
      Suggested by Ben Hoyt.

   *  Converting control character checking of keys based on performance
      testing of alternatives by Ben Hoyt.
Merge remote-tracking branch 'upstream/master'

Conflicts:
	memcache.py