Support REQUEST_METHOD variable in IIS URL Rewrite file parsing

[DamianEdwards]

We should support the {REQUEST_METHOD} variable when parsing IIS URL Rewrite files. If there's a code equivalent we should support it there too of course. It represents the current request verb (e.g. 'get', 'head', 'post', etc.).

As it stands, the rules in live.asp.net aren't supported.

[DamianEdwards]

@muratg @glennc

[davidfowl]

Wondering what other missing server variables there are....

[DamianEdwards]

[jkotalik]

I blame documentation even though it is like 90% my fault XD

[davidpeden3]

@Tratcher

fixed in 3c8f2d4

[Eilon]

This patch bug is approved. Please use the normal code review process w/ a PR and make sure the fix is in the correct branch, then close the bug and mark it as done.

[Eilon]

@muratg please assign this bug.