Simplify npm scripts

Double `jasmine-node` in `npm test` was giving me trouble.  Got rid of `./node_modules/.bin` prefixes while I was in there.  Npm includes `/node_modules/.bin` in the `$PATH` for scripts [by default](https://www.npmjs.org/doc/misc/npm-scripts.html#path).  Gathered from an old [substack post](http://substack.net/task_automation_with_npm_run#the-scripts-field).