build: Bump miscellaneous devDependencies to latest

Updates:
* grunt                  0.4.2 -> 0.4.5
* grunt-banana-checker   0.1.0 -> 0.2.0
* grunt-contrib-csslint  0.2.0 -> 0.3.1
* grunt-jscs             0.6.1 -> 0.7.1

Change-Id: If1d612cd4ad9b45b0d249931339882f4bc238c74
Merge "build: Bump miscellaneous devDependencies to latest"