missing "http:" in the @import rule

short story:
if the URL begins with "//" then browser doesn't fetch the data from googleapis.com, but tries to get the file from file:// location

long story:
I have installed foundation using "bower install foundation", created index.html and found this issue, because page was loading for about 10 seconds. I am proposing this fix into zurb/foundation but have now no chance to build it and test it afterwards - it should work, but it would be great if somebody could make sure that this is valid fix