Return 405 correctly even if version is using as header and wrong request method

[namusyaka]

This reverts commit a0166e7.

I'll try to fix this problem drastically.

[namusyaka]

@dblock Could you take a look this pull request?
I think this approach can fix potential bugs and issues.
If ok, we can release 0.16.2 version ;)

[dblock]

I see it now :) Better.

[dblock]

You might want to audit the use if @variable elsewhere, we have at least an @app_response in a formatter middleware, @named_params in a DSL helper and @versions in routing.

[dblock]

This worked everywhere where I saw problems, feel free to cut 0.16.2, which is #1360. I would review the use of @... first though.

[namusyaka]

The @method_not_allowed variable usage is wrong. It returns true eternally if method_not_allowed is set even once.
Other @~ vars looks like no problem.

[dblock]

I should have caught @ in the code reviews too, my bad.

[namusyaka]

I've mistaken the coding. Sorry for the bad patch. Btw, we can release the v.0.16.2 now. I'll prepare it soon.