new: ``relative`` optional argument to ``Time.strptime()`` to set default unparsed info to current date and time info.
new: make some API changes towards simplification. Old API kept with deprecation warnings.
fix: removed hidden system call ``time.mktime`` did to get local sys time. Changed ``Time.strptime()`` API a bit. Hopefully clearer.
chg: dev: cosmetic changes in doc. @minor
fix: pkg: typo @minor
new: ``datetime_to_timestamp`` support non-naive datetime and output a UTC timestamp whatever the timezone information is.
new: doc: added a quick overview in the default README.rst
new: pkg: added a gitchangelog configuration file.
fix: pkg: ``autogen.sh`` don't fail anymore if it doesn't find ``gitchangelog`` binary.
new: pkg: added the travis hook.