enable travis bundler caching
enable travis bundler caching

johnathan99j/history-project,johnathan99j/history-project,johnathan99j/history-project,johnathan99j/history-project,johnathan99j/history-project,newtheatre/history-project,newtheatre/history-project,newtheatre/history-project,newtheatre/history-project,newtheatre/history-project