Update nose2/plugins/junitxml.py

Added some checked for cleaning up invalid unicode characters from output XML.
the xml cleanup patch was not Python 3 friendly
Moved XML cleanup functions to util.py.  This seems like a better idea.
Added tests and final cleanup
PEP 8 Cleanup
assertRegexpMathces is depreciated in 3.x and doesn't exist in unittest2 (2.6).
moved _xml_util.py back into junitxml.py
Organize imports
All control structures of _time() should return values

In case of exception, function _time() doesn't return anything,
and this causes float conversion failure at L:61
Merge pull request #63 from dukavi/master

junitxmlreporter: All control structures of _time() should return values
prevent DeprecationWarning for compiler package on python 2.7

nose2/util.py:14: DeprecationWarning: The compiler package is deprecated
and removed in Python 3.x.

  from compiler.consts import CO_GENERATOR
Merge pull request #68 from max-arnold/master

Fix for DeprecationWarning on python 2.7 (issue #64)
Update python version support list to include 3.3
Update changelog
Bump version
Fix broken import in collector.py.
Let loadPlugins() support any sequence type, not just list.
Add unit test for collector module.  Hide six egg from git.
Fixed a few formatting issues in the changelog.
Merge pull request #73 from thedrow/patch-1

Fixed a few formatting issues in the changelog.