move two instance variables to __init__
stop lammps from outputing to screen
Add simple tests
Update to match simphony ( simphony/simphony-common#9 )

simphony/simphony-common@0c8a45b39a256b7141b517bfdee376022d7cb028
Reorganize example
initial version of example (matches up with LAMMPS example)
Update example doc note and fix pep8 errors
Fix example and unit tests
remove couette flow and simplify dump statements
update thermo doc in example
update dump commands in example
fix dump command
Update comment on cache flag