Fix type specs in base64url
Merge pull request #127 from talko/base64url_dialyzer

Fix type specs in base64url
update travis config for 17.0 and R16B0[123]
upgrade rebar to v2.5.0 and upgrade app template #131
Makefile: adapt rebar calls to new behavior

* rebar prepare-deps is equivalent to rebar -r get-deps compile
* Only rebar *-deps and rebar compile are recursive by default.
  Therefore, we don't need to pass skip_deps=true.
Merge pull request #132 from tuncer/rebar-recursion

Makefile: adapt rebar calls to new behavior
more updates from primary mochiweb repo

Also add 17.1 to .travis.yml.