Migrate to jest + add coveralls

.gitignore

@@ -6,3 +6,5 @@ node_modules
 /.project
 /.idea/*
 test/sample-feed/
+.coveralls.yml
+coverage

.travis.yml

@@ -2,4 +2,8 @@ language: node_js
 node_js:
         - node
         - lts/*
-script: timeout=4000 npm run test
+script:
+        - npm test
+
+after_success:
+        - npm run coveralls

README.md

@@ -1,6 +1,6 @@
 # GTFS to Linked Connections
 
-[![Build Status](https://travis-ci.org/linkedconnections/gtfs2lc.svg?branch=master)](https://travis-ci.org/linkedconnections/gtfs2lc) [![npm](https://img.shields.io/npm/v/gtfs2lc.svg?style=popout)](https://npmjs.com/package/gtfs2lc) [![Greenkeeper badge](https://badges.greenkeeper.io/linkedconnections/gtfs2lc.svg)](https://greenkeeper.io/)
+[![Build Status](https://travis-ci.org/linkedconnections/gtfs2lc.svg?branch=master)](https://travis-ci.org/linkedconnections/gtfs2lc) [![npm](https://img.shields.io/npm/v/gtfs2lc.svg?style=popout)](https://npmjs.com/package/gtfs2lc) [![Greenkeeper badge](https://badges.greenkeeper.io/linkedconnections/gtfs2lc.svg)](https://greenkeeper.io/) [![Coverage Status](https://coveralls.io/repos/github/linkedconnections/gtfs2lc/badge.svg?branch=greenkeeper/initial)](https://coveralls.io/github/linkedconnections/gtfs2lc?branch=greenkeeper/initial)
 
 Transforms a GTFS file into a directed acyclic graph of actual _connections_.