any() and all() to take a list as a condition

[wearp]

Modified queries.py for any() and all() to take a list as condition. They still function along the lines of python's all() and any(). Inspired by mongodb's $all.

Examples:

where('followers').any(['don', 'jon'])
where('followers').all([{'name': 'john'}, {'age': 17}])

Tests are for free!

[eugene-eeo]

I think using callable instead of isinstance would be better since we can pass in sequences (tuples, sets, lists) as well.

[wearp]

Thanks - makes sense to me.

[msiemens]

Thanks, @wearp! Could you also update the docs (docs/usage.rst in particular) accordingly? If not, I'll do it.

[wearp]

No problem @msiemens! That's done.

[msiemens]

Thanks!