change file saving to Compound
change file saving to Compound

Changed examples from creating trajectory object to output files.

File ouput is usable from the compound itself.

tcmoore3/mbuild,sallai/mbuild,sallai/mbuild,tcmoore3/mbuild,ctk3b/mbuild,iModels/mbuild,summeraz/mbuild,ctk3b/mbuild,summeraz/mbuild,iModels/mbuild