Implementing HTTP 405

[Drunpy]

This PR is the same as #1276 but without formatting changes. Solves #1224

[SergioBenitez]

Please see this part of my previous comment:

My concern is the performance impact that this will have. It's very nice to be able to filter by method: it means we use it as a prefix. We should not remove this from the router. At worst, we should simply iterate through all possible methods, checking to see if there's a match, in case no route was found. This means we take the performance hit only if there's no match initially.

[Drunpy]

Sure, I will implement this way.

[Drunpy]

Hey @igalic thanks for your valuable comments, I've done some modifications based on these!

[SergioBenitez]

@Drunpy Note that to get this PR accepted, in addition to the changes requested, you'll need to rebase on master, not merge it in.

[SergioBenitez]

I'm still in favor of this, but simply closing due to inactivity.