Adding extra data to request

[gmgalvan]

Description

Make a clear and detailed description of your changes, with the added benefits.

Adding an extra data to Request that would allow middleware to process data that is not part of the request's body
Example a new middleware that could wrap extra information to teh Request and later be processed.

Possible drawbacks

None

Related issue(s)

List all related issues here:

• closes Request extra-data or with context value #117

Additional information

[coveralls]

Pull Request Test Coverage Report for Build 330423480

• 2 of 2 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.0007%) to 98.786%

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Totals
Change from base Build 328989724:	0.0007%
Covered Lines:	3661
Relevant Lines:	3706

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💛 - Coveralls

[gmgalvan]

Just I have a doubt about where to initialize it empty in order to avoid memory usage and if is needed an example in a build in middleware or new one.

[System-Glitch]

Currently the map will be nil everywhere, you have to initialize it empty in router.go#requestHandler() and testsuite.go#CreateTestRequest().

A quick example in the documentation would be nice too.

[gmgalvan]

I added one example about creating a new middleware and adding the extra information to the request, and I think I initialize empty in router.go#requestHandler() and testsuite.go#CreateTestRequest() the Extra property. mm do we need to update the branch? or something that am I missing?

[System-Glitch]

Thank you very much!