Removed unnecessary resort of document keys
Removed unnecessary resort of document keys

docKeys() already sorts the returned document keys.

henrylee2cn/mgo,mjs/mgo,Danzeer/mgo,jjz/mgo,jackspirou/mgo,dmage/mgo,go-mgo/travis-test,tchajed/mgo,raymondjacobson/mgo,Yottaa/mgo.v2,tchajed/mgo,hexadecy/mgo,tchajed/mgo,lucasjo/mgo,jackspirou/mgo,deafgoat/mgo,tmc/mgo,velocity-toolkit/mgo,deafgoat/mgo,tchajed/mgo,deafgoat/mgo,dmage/mgo,gabrielrussell/mgo,raymondjacobson/mgo,velocity-toolkit/mgo,hexadecy/mgo,jjz/mgo,Yottaa/mgo.v2,lucasjo/mgo,mjs/mgo,mcuadros/mgo,dmage/mgo,mjs/mgo,raymondjacobson/mgo,gabrielrussell/mgo,hexadecy/mgo,tchajed/mgo,go-mgo/travis-test,hexadecy/mgo,DroiTaipei/mgo,Danzeer/mgo,henrylee2cn/mgo,jjz/mgo,tmc/mgo,DroiTaipei/mgo,dmage/mgo,go-mgo/travis-test,gabrielrussell/mgo,tmc/mgo,mcuadros/mgo,tmc/mgo,henrylee2cn/mgo,raymondjacobson/mgo,velocity-toolkit/mgo,lucasjo/mgo,jackspirou/mgo,Yottaa/mgo.v2,mcuadros/mgo,SocialExplorerFork/mgo,lucasjo/mgo,jackspirou/mgo,mcuadros/mgo,Danzeer/mgo,go-mgo/travis-test,SocialExplorerFork/mgo,DroiTaipei/mgo,gabrielrussell/mgo,jjz/mgo,SocialExplorerFork/mgo,SocialExplorerFork/mgo,DroiTaipei/mgo,mjs/mgo,Danzeer/mgo,deafgoat/mgo,henrylee2cn/mgo,velocity-toolkit/mgo,Yottaa/mgo.v2