WIP: Implement pagination headers

[rambobinator]

Hi, I PR this as apparently there is a need (@trubesv ). At least we can discuss the implementation.

[ramnes]

It lacks a test case, though.

Yep, it really does!

Also, check the Travis build, it's failing.

[coveralls]

Pull Request Test Coverage Report for Build 130

• 36 of 36 (100.0%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 108:	0.0%
Covered Lines:	399
Relevant Lines:	399

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💛 - Coveralls

[rambobinator]

Concerning the current implementation, i tried to stick to the RFC linked by @tobes. Don't you think it's the best thing to do ? https://tools.ietf.org/html/rfc5988#page-6

[ramnes]

Don't we want the dict values in the body to only contain the links, without the >; rel='...' part?

[ramnes]

PyMongo already handles that for the limit: it keeps the absolute value and consider 0 as "no limit". We might want to validate that skip is a positive integer though, or just handle the ValueError that PyMongo would raise.

[ramnes]

I think we should simply not offer the relatives links if we're on an edge.