add rubyforge project name to gemspec
add rubyforge project name to gemspec

yyyc514/useragent,art19/useragent,mycolorway/useragent,intercom/useragent,gshutler/useragent,crashlytics/useragent,bf4/useragent,clemens/useragent,ishumilova/useragent,xing/useragent,wavii/useragent,arches/useragent,mkilling/useragent,albertbellonch/useragent,tape-tv/useragent,SalesLoft/useragent,yappbox/useragent,charliesome/useragent,hiroshi/useragent,imulus/useragent,545ch4/useragent,michieldewit/useragent,jasonfb/useragent,brjennin/bond,assembler/useragent,clevertechru/useragent,paulcbetts/useragent,jakswa/useragent,springleaf/useragent,joneslee85/useragent,ndbroadbent/useragent,Magnetic/useragent,michaeldauria/useragent,dgraham/useragent,superp/useragent