In case `source_roout` is not set, `default_source_root` is used,
which includes also `templates` directory. If there is no `templates`
directory, `default_source_root` is not available and USAGE will not
be displayed. USAGE should be also checked based on default
directory excluding `templates`.

Added a generator option to remove the public/index.html file when generating a new Rails application

The option is:
-i, [--skip-index-html]        # Skip public/index.html file

[Carlos Antonio da Silva & Santiago Pastorino]

[Carlos Antonio da Silva & Santiago Pastorino]

[Carlos Antonio da Silva & Santiago Pastorino]

[Carlos Antonio da Silva & Santiago Pastorino]

Change application controller template accordingly, to inherit from
ActionController::HTTP and not generate protect_from_forgery call.

[Carlos Antonio da Silva & Santiago Pastorino]

uses PATCH for the forms of persisted records, and routes PATCH and PUT to the update action of resources

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.

We still looking for a best presentation for tests output.