Updated the pickling test to ensure topology is unchanced.
Updated the pickling test to ensure topology is unchanced.

Bond order info is not checked when comparing bond objects in
topology, may be missing information

mdtraj/mdtraj,dwhswenson/mdtraj,mattwthompson/mdtraj,leeping/mdtraj,rmcgibbo/mdtraj,gph82/mdtraj,mattwthompson/mdtraj,rmcgibbo/mdtraj,jchodera/mdtraj,mattwthompson/mdtraj,gph82/mdtraj,jchodera/mdtraj,rmcgibbo/mdtraj,jchodera/mdtraj,mdtraj/mdtraj,jchodera/mdtraj,gph82/mdtraj,leeping/mdtraj,mdtraj/mdtraj,leeping/mdtraj,dwhswenson/mdtraj,dwhswenson/mdtraj,leeping/mdtraj,mattwthompson/mdtraj