Add an array_including argument matcher

Closes #295.

Signed-off-by: Sam Phippen <samphippen@googlemail.com>
Merge pull request #301 from samphippen/array-including-matcher

Add an array_including argument matcher
Fix an array_including docstring.

Signed-off-by: Sam Phippen <samphippen@googlemail.com>
coveralls setup
update readme
tweak setup