Add releases and semantic versioning, re: #1421#1431

Merged

catarak merged 2 commits intodevelopfrom

feature/versioning

May 26, 2020

Commits on May 21, 2020

Update travis.yml with new branch names, add git flow to development and release guides
catarak
committed
Update release guide with git flow steps, update Travis deployment to use git tag
catarak
committed