Merge branch 'master' into develop
Update HISTORY.rst
Merge branch 'master' into develop
added center_of_mass function to compound, fixed assertion in has_parts_mixin
added preliminary installation instructions
added installation instructions to readme
typo
Update INSTALLATION.rst
fixed readme
Update README.rst
touched up examples and some documentation
unit handling for hoomdxml reader
Merge pull request #34 from tcmoore3/lj_units

unit handling for hoomdxml reader
Update README.rst
Update README.rst
Update README.rst
Update README.rst
removed prototype, started on tutorial
added 'atoms' property to compound, renamed atoms() function to yield_atoms()
added 'bonds' property to compound, renamed atoms() function to yield_bonds()