Beginnings of a Amber restart file support in mdtraj.
Merge branch 'master' into amber-rst
Add NetCDF restart file support.
Add load_restrt and load_ncrestrt to the top-level mdtraj namespace.
A couple small fixes. ASCII restart files appear to be properly read now.
Fix AmberNetCDFRestart file so that the data is copied (avoids a segfault with
some newer versions of scipy) and a vestigial file opening is removed.
Add tests for Amber restart file parsing.  Box angles don't quite work yet, not
sure why.
Fix cell angles in writing.
Add info about the inpcrd/ncinpcrd.rst7 files
Incorporate Robert's suggested changes and comments.
Check for appropriate attributes on the NetCDF Restart file.

This also changes the "Application" attribute from "AMBER" to "Omnia" for NetCDF
trajectories that are written.  That will match the NetCDF Restart files that
are written from the code in this PR.  Also a plug for Omnia (albeit a tiny one
that probably nobody will ever notice).
Enable flushing.
Improve unicode/byte handling in Amber NetCDF restart file parser so it plays
better with the bytes/unicode split in Py3k
Merge pull request #595 from swails/amber-rst

Add support to read and write Amber restart files