Tooling update (#184)

* Use a common Makefile/build process

* Use ESLint with the pa11y lint config

data/.eslintrc.js

@@ -0,0 +1,8 @@
+'use strict';
+
+// Clone the main config
+var config = module.exports = JSON.parse(JSON.stringify(require('../.eslintrc')));
+
+// Disable max line length/statements
+config.rules['max-len'] = 'off';
+config.rules['max-statements'] = 'off';