Release v1.9.2 (mdtraj#1373)

v1.9.2 (July 30, 2018)
---------------------

We're pleased to announce the release of MDTraj 1.9.2. This version has a number of bug fixes and improvements for trajectory parsing and conversion.
		
 - Fix bug in TINKER ARC reader (mdtraj#1371)
 - Improved mdconvert error message (mdtraj#1368)
 - Striding relative to current position in XTC and TRR (mdtraj#1364)
 - Return last successful read frame for DCD (mdtraj#1358)
 - Handle stride like numpy for DCDs (mdtraj#1352)
 - Fix pickling of virtual site's element field (mdtraj#1350)
 - Compile geometry extension with OpenMP (mdtraj#1349)
 - Ensure correct dtype in neighborlist box vectors (mdtraj#1344)
 - Added support for prm7 topology file extension (mdtraj#1334)
 - Added efficient stride handling fo TRR (mdtraj#1332)
 - Use byte offsets between frames for stride of XTCs (mdtraj#1331)
 - Updated the calculation of chi5 (mdtraj#1322, mdtraj#1323)
 - Added testing against conda-forge channel (mdtraj#1310)
 - Port [OpenMM bond order](openmm/openmm#1668) representation into MDTraj. Implements the `Bond` class to Topology and updates the Mol2 reader to use bond_order field (mdtraj#1308)

Release version 1.9.1

Due to a previous mistake where I uploaded version 1.8
to PyPI as version 1.9.0, it won't let me upload another
file with version 1.9.0. So I'm bumping the version
number.

Release 1.9.0

Release 1.8.0

Release 1.7.2

Release 1.7.1

Release 1.7

Release 1.6.2 w/ doc fixes

Release 1.6.1

 - Add date of release to whatsnew.rst

Release 1.6