Released version 4.0.0

Released version 3.2.2

Merged in thduynguyen/gtsam-duy/fix/upgrade_eigency (pull request bor…

…glab#322)

upgrade eigency to latest version with bug fixes.

GTSAM 4.0 with python/cython issue still in flux

Merge branch 'develop'

Released version 3.2.1

Released version 3.2.0

Released version 3.2.0

Released version 3.0.0

Released version 2.4.0