checkpoint

Tests pass with ZODB4/Py3.  Still need to get tests passing with various
py2 and ZODB3 combinations
Before.before is always bytes
a handful of tests pass on py2.7
add .gitignore
tests pass on python 2 and 3
update release notes
unneeded str() call
remove dead code
don't depend on ZODB or ZODB3
initial travis support
simplify travis.yml
include zope.testrunner in travis.yml
don't use local times
Merge pull request #1 from jamur2/zodb4-support

ZODB4 support