initial draft of lammpstrj file format
updated author
fixed py2.6 compatibility for formatted strings
preliminary triclinic box reading; could probably just create box vectors internally instead of converting to lengths/angles; needs proper test cases
merged with upstream
added writing for triclinic boxes; only test right now is for self-consistency (write/read)
added saver to Trajectory and a unit test for it
Merge pull request #639 from ctk3b/master

initial draft of lammpstrj file format