add test for behavior
Dealing with lack of unitcell in DCD
Fixes for both xtc and trr
minor efficiency improvement
Simplify a little bit
Merge pull request #330 from rmcgibbo/unitcell

Avoid writing bogus unitcell info to disk for trajs without PBCs
Update pdbfile.py

Added ability to download pdb or compressed pdb from url.
Update pdbfile.py

changed urllib2 to urllib
Update test_pdb.py

added test to see if pdb url works correctly
Merge branch 'patch-1' of github.com:cxhernandez/mdtraj into pdb-url
Changed the detection of URLS to use urlparse from the stdlib instead of just checking for http://
Changed the detection of URLS to use urlparse from the stdlib instead of just checking for http://
remove print
change back imports
py3 stringio fix
try to fix failure
I HATE UNICODE BULLSHIT
Merge pull request #335 from rmcgibbo/pdb-url

load_pdb from URL
update tests
unicode fix