build: Bump various devDependencies to master
build: Bump various devDependencies to master

 grunt-banana-checker     0.5.0  →  0.6.0
 grunt-contrib-cssmin     1.0.2  →  2.0.0
 grunt-contrib-less       1.4.0  →  1.4.1
 grunt-contrib-uglify     2.0.0  →  2.2.0

Change-Id: Ic4d879c5948d8425e62bb915cd8b91175526a3d0

wikimedia/oojs-ui,wikimedia/oojs-ui,wikimedia/oojs-ui,wikimedia/oojs-ui