Update dependencies

Dependencies:
- globule-0.2.0:
  - significantly improves exclusion (`!`) speed
  - adds `src` option for more flexibility in pattern specification
  - updates its dependencies to latest versions

Development dependencies:

  - latest `grunt` and `grunt-cli`
  - latest `grunt-svgmin` so that when running `npm test`/`grunt` the message
    'Direct yaml files load via require() is deprecated! Use safeLoad() instead.'
    does not show.