some plasmid map refactoring and scss import changes
Merge branch 'develop' into plasmid_mapping_update
Merge branch 'develop' into plasmid_mapping_update
Merge branch 'develop' into plasmid_mapping_update

Conflicts:
	app/assets/stylesheets/application.css.scss
began significant overhaul of plasmid mapping code; draws circle and point feature marks so far
point features working
completed plasmid mapping rewrite
update ruby versions in CI config
work in progress on creating an install/update script