Spring Update references to RFC 2616

Replace references to the old RFC 2616 (HTTP 1.1) with references to the new RFCs 7230 to 7235.

This commit also deprecates: - HttpStatus.USE_PROXY - HttpStatus.REQUEST_ENTITY_TOO_LARGE in favor of HttpStatus.PAYLOAD_TOO_LARGE - HttpStatus.REQUEST_URI_TOO_LONG in favor of HttpStatus.URI_TOO_LONG

Issue: SPR-12067

Comment From: sdeleuze

@poutsma If you can, could you please review this PR ?

This is mostly documentation changes, but it impacts also the API, and since we are just before 4.1.RC2, I would like to be 100% sure that my changes are fine. Thanks!

Comment From: poutsma

Looks good to me. On 5 aug. 2014, at 16:56, Sébastien Deleuze notifications@github.com wrote:

@poutsma If you can, could you please review this PR ?

This is mostly documentation changes, but it impacts also the API, and since we are just before 4.1.RC2, I would like to be 100% sure that my changes are fine. Thanks!

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Comment From: sdeleuze

Merged, thanks.