Merge pull request #512 from kyleabeauchamp/master

Remove performance tests.
Some more text on the API docs pages
Merge pull request #513 from rmcgibbo/docs-narative

Some more text on the API docs pages
restrict atoms inplace=False
fix test
Added -pH and -temperature arguments to ShiftX2 wrapper.
geometry header sse fix
pH and temperature arguments set to ShiftX2 defaults.
Merge pull request #517 from rmcgibbo/geometry-header-sse

geometry header sse fix
Updated docstring
inplace
typo
typo
right. get the default correct
Merge pull request #515 from leeping/master

Added -pH and -temperature arguments to ShiftX2 wrapper.
Merge pull request #519 from rmcgibbo/restrict-atoms-2

atom_slice
Force unit cell vector components that are close to zero (and should be formally
zero) to zero exactly.
Fix (hopefully) the zeroing of relevant box vector components.
Merge pull request #521 from swails/master

Make unit cell vector components that are almost zero exactly zero.
Update README.md