Added (jade = ) to be compatible with new jade version

Added `jade = ` to be compatible with new version of Jade
runtime.js does not include this since this commit https://github.com/visionmedia/jade/commit/72043cd7ed1d7dbed6dcd9ca315c9f1f41ef38b3#diff-180a4c8e5bf3b0c453ab1a7e06c9e0ceL2