Minor tutorial updates
Deprecate R14
Fix dict:dict() vs. dict() Erlang/OTP 17 incompatibility
Update rebar (2.2.0-61-g97751ec)
Update overview.edoc
Update user's guide
Update copyright
Refresh edocs
Update bootstrap-docs submodule
Update asciidoc recipe
Merge branch 'master' of github.com:ubf/ubf into upstream-master