Merge pull request pyxem#84 from pc494/RELEASE-0.2.3

Commiting for release 0.2.3

Merge pull request pyxem#74 from pc494/0.2.2

Bump version to 0.2.2

Merge pull request pyxem#73 from pc494/0.2.1

version bumped to 0.2.1

Merge pull request pyxem#72 from pc494/release-changes

Release changes

Merge pull request pyxem#34 from dnjohnstone/v0.1.5

V0.1.5

Merge pull request pyxem#34 from dnjohnstone/v0.1.5

V0.1.5

Merge pull request pyxem#20 from dnjohnstone/fix_appveyor

Bug fixes for 0.1.4

Update README.rst

Merge pull request pyxem#12 from dnjohnstone/master

update setup.py install_requires

Merge pull request pyxem#10 from dnjohnstone/master

add __init__ to diffsims.sims