can't run tests if git not compiled with libcurl

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.

it's needed until new rack release with Rack::BodyProxy fixes
https://github.com/rack/rack/commit/b06ef82876416fe69429f7d3ee6e51bf26aec75f

allow people to set a local .Gemfile so that things like ruby-debug are not required for regular development

As rake 0.9.2.2 is out with the same 
fix as 0.9.3.beta having

THis version is compatible with 3.1 and above