build: Update devDependencies

* grunt v0.4.2 to v0.4.4
  - Change log:
    https://github.com/gruntjs/grunt/blob/v0.4.4/CHANGELOG

* grunt-contrib-jshint v0.8.0 to v0.9.2
  - Change log:
    https://github.com/gruntjs/grunt-contrib-jshint/tree/v0.9.2#release-history
  - Upstream (all JSHint v2.4.x releases):
    https://github.com/jshint/jshint/releases

* grunt-contrib-watch v0.5.3 to v0.6.1
  - Change log:
    https://github.com/gruntjs/grunt-contrib-watch/tree/v0.6.1#release-history

* grunt-recess v0.5.0 to v0.6.1
  - Change log:
    https://github.com/sindresorhus/grunt-recess/compare/v0.5.0...v0.6.1
   - In particular, for us, sindresorhus/grunt-recess#57 [1] was fixed.

[1] https://github.com/sindresorhus/grunt-recess/issues/57

Change-Id: I655ba7286a5e6a2f81030043a9782b20638e205b