Version (#104)

* release notes

* version bump

add automatic releases

Merge pull request #75 from rubisco-sfa/nate/final

Final bugfixes for v2.7

incremented version to 2.5

here and beyond ILAMB is python3 only

Last tag compatible with python2.7x

cf_units requires more recent numpy but does not have it in their req…

…uirements

updated to 2.2

Merge branch 'ncollier/stage-next-version'