Filter object

[targuan]

As discussed in #152, this is a basic implementation of Django's Q object filtering schema.
In order to use it, one have to construct a filtering object F which will represent how one want to filter.
The objects can be combined with the logicals operators

• & which allow object matching the conditions of both F object
• | which allow object matching the conditions of one of the F object
• ~ which allow object matching none of the conditions of the F object

Tests are quite explicit I think but I can clarify if needed.
I have integrated the others django operators (mostly the contains operator) as in #152.

This implementation is done in the plugins section as I think as this as a helper to filter with more granularity than the basic key=value method.
If for consistency reason (or other reasons) the F filtering method should be kept as the only method (by converting the **kwargs to a F object) it can be moved to the core.

[coveralls]

Pull Request Test Coverage Report for Build 698

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.5%) to 92.11%

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Totals
Change from base Build 693:	-0.5%
Covered Lines:	1004
Relevant Lines:	1090

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💛 - Coveralls

[dbarrosop]

I think we should consider this core functionality so I'd place it under nornir/core/filter.py

[dbarrosop]

As per above comment this should be "tests/core/test_filter.py".

Also, please, follow the same pattern as with the rest of the tests, please.

[dbarrosop]

Overall looks great, I have to do some more testing of my own and play a bit with yet but I think this is the right direction :)

[targuan]

I moved the filter to nornir/core.
Can you check if the updated tests are what you had in mind.

follow the same pattern as with the rest of the tests, please.

[dbarrosop]

Awesome work! :D

I am going to merge it into a branch and play a bit with it as I add a note in the tutorial about this :)

[ktbyers]

Thanks for doing this work @targuan !