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-clean    0.5.0 -> 0.6.0
* grunt-contrib-csslint  0.2.0 -> 0.3.1
* grunt-css-url-embed    1.0.0 -> 1.0.3
* grunt-jscs             0.6.1 -> 0.7.1
* grunt-karma            0.8.3 -> 0.9.0
* karma                  0.12.17 -> 0.12.23
* karma-coverage         0.2.4 -> 0.2.6
* karma-sauce-launcer    0.2.9 -> 0.2.10

Change-Id: I2e033b316b14552c33008d8e53f3e4285a054e86
Merge "build: Bump miscellaneous devDependencies to latest"