PATCH is the correct HTML verb to map to the #update action. The
semantics for PATCH allows for partial updates, whereas PUT requires a
complete replacement.

Changes:
* adds config.default_method_for_update you can set to :patch
* optionally use PATCH instead of PUT in resource routes and forms
* adds the #patch verb to routes to detect PATCH requests
* adds #patch? to Request
* changes documentation and comments to indicate support for PATCH

This change maintains complete backwards compatibility by keeping :put
as the default for config.default_method_for_update.

Moved all test cases into a new test/cases directory to match Active Record test directory structure.
Signed-off-by: NJoshua Peek <josh@joshpeek.com>

Signed-off-by: NPratik Naik <pratiknaik@gmail.com>

Format related patches to support serializing data out in the correct format with correct http request headers per http method type [#450 state:resolved]
Signed-off-by: NTarmo Tänav <tarmo@itech.ee>
Signed-off-by: NJeremy Kemper <jeremy@bitsweat.net>

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@8566 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@8503 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@8502 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

Added ActiveResource.format= which defaults to :xml but can also be set to :json [DHH]. Added one-off declarations of mock behavior [DHH]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@7518 5ecf4fe2-1ee6-0310-87b1-e25e094e27de