back out of 7453eb4b6741bc016b6543010d14960e37c04e6d
update release tag
back to dev
Always register known namespaces. Warn if etree version is unsupported.
Merge pull request #119 from kwilcox/master

Always register known namespaces. Warn if etree version is unsupported.
update release version
back to dev
Add a tox config.  Helps testing against all of the python/lxml configs.

Also started running tests against doctests in *.py files, which I didn't
realize was turned off!  Fixed the few that existed so they passed.
Merge pull request #120 from kwilcox/tox

Add a tox config.  Helps testing against all of the python/lxml configs.