removing duplicate httpclient dependency and add missing commons-codec
removing duplicate httpclient dependency and add missing commons-codec

manixate/bitbucket-pullrequest-builder-plugin,maxvodo/bitbucket-pullrequest-builder-plugin,Page-/bitbucket-pullrequest-builder-plugin,yzzyx/bitbucket-pullrequest-builder-plugin,linjer/bitbucket-pullrequest-builder-plugin,maxvodo/bitbucket-pullrequest-builder-plugin,slobo/bitbucket-pullrequest-builder-plugin,atsushi-ageet/bitbucket-pullrequest-builder-plugin,Sanchiz/bitbucket-pullrequest-builder-plugin,atsushi-ageet/bitbucket-pullrequest-builder-plugin