Gzip middleware doesn't automatically decompress incomming requests

[lunemec]

Issue Description

Upon server receiving POST request with content-encoding: gzip set the gzip middleware doesn't decompress the data.
This causes strange errors when trying to Bind() data (for example form/multipart): multipart: NextPart: EOF.

When decompressing the ctx.Request().Body manually inside the handler everything works as expected.

Expected behaviour

GzipMiddleware should? (probably) handle compression and decompression transparently, or it should be stated in the Bind examples it does NOT.

Actual behaviour

GzipMiddleware only compresses outgoing responses.

Steps to reproduce

Send any POST that contains form/multipart and is gzipped.

Version/commit

current master

[stale]

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