Plugin installation and removal scripts via npm

- `npm run pluginstall`
- `npm run plugremove`
Update README and fix syntax issue (no spanning lines... d'oh)
Merge pull request #388 from SpiderOak/plugin-install-and-remove

Plugin installation and removal scripts via npm

Is good!

(The Travis failure is due to tests that were broken by the Zepto-1.0RC1 reversion, and has fixes already merged to master.)