New task added to default set: jsonlint
Update dev dependencies
Update dependencies

Minor version updates:

* grunt-contrib-clean
* time-grunt

Patch updates:

* grunt-jscs (moving to new name; previously grunt-jscs-checker)
v3.3.0

* `jsonlint` task added to default - verifies that *.json files in root dir are well-formed
* Minor version updates: `grunt-contrib-clean`, `time-grunt`
* Patch updates: `grunt-jscs` (moving to new name; previously `grunt-jscs-checker`)
* Update dev dependencies