This version has many bug fixes of course. In addition,
(1) There are many improvements to the contextual bandit code thanks to Alberto Bietti (https://arxiv.org/abs/1802.04064 ).
(2) There are significant improvements to save_resume due to @denik.
Internally,
(a) The argument parsing code has been rewritten to be more consistent throughout the code base via parser_helper.h.
(b) There are significant improvements in the way that multiline examples are handled thanks to @rajan-chari
Note that unlike previous release versions, I've left the "Makefile" build system in place rather than using Automake. Automake is still available if desired, but you'll need to run it manually if you want to use it.