update dependencies to latest
update dependencies to latest

grunt-contrib-jshint from ~0.6.0 to ^0.10.0
grunt-contrib-clean from ~0.4.0 to ^0.6.0
grunt-contrib-nodeunit from ~0.2.0 to ^0.4.1
grunt from ~0.4.1 to ^0.4.5

EastCloud/grunt-aws-sdk,justhamade/grunt-aws-sdk