web: Move client-app build from Grunt to Makefile/Webpack

- All stylesheets are inlined in JavaScript and loaded dynamically
- Fonts are inlined
- Foundation JavaScript is inlined, extra jQuery version could be
  dropped
- To fix GitHub language detection, built JavaScript was moved to the
  'packages' directory.
web: Implement cropping during capture
Remove compiled packages from version control
Merge branch 'livecrop'

Conflicts:
	spreadsplug/web/client/packages/bundle-dev.js
	spreadsplug/web/client/packages/bundle-dev.js.map
	spreadsplug/web/client/webpack.config.dev.js
	spreadsplug/web/client/webpack.config.js
web: Fix webpack configuration
web: Fix index test