Clarify that the Runner.Run applies operations in order in the txn package, as suggested by Roger. 
Clarify that the Runner.Run applies operations in order in the
txn package, as suggested by Roger. 

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