Fail more informatively when google-spreadsheet-ruby isn't present.
Fail more informatively when google-spreadsheet-ruby isn't present.

RobertRehberg/roo,pricematch/roo-legacy,xchanging-mm4/roo,SciMed/roo,roo-rb/roo,airblade/roo,reshleman/roo,pricematch/roo-legacy,pk4media/dartroo,OpenGov/roo,fabien-michel/roo,myplaceonline/roo,pabloh/roo,enemycnt/roo,SciMed/roo,stevendaniels/roo,pricematch/roo-legacy,OpenGov/roo,thotmx/roo,salsify/roo,malept/roo,visagio/roo,pk4media/dartroo,OpenGov/roo,maruware/roo,culturecode/roo