Optimize ActiveResource::Base.new(attributes)

* Add performance benchmark similar to ActiveRecord
* Lazily find_or_create_resource_for_collection to not incur the overhead for empty arrays and arrays of primatives
* #duplicable? is faster than inline rescues when the object is not duplicable
* Don't constantly raise and handle NameError, raising is expensive
* Even when a resource is nested inside a module, always look inside the class first for the resource definition so we don't overwrite classes all the time

Before:                                     user     system      total        real
Model.new (instantiation)               0.120000   0.000000   0.120000 (  0.119961)
Nested::Model.new (instantiation)       0.150000   0.010000   0.160000 (  0.151183)
Model.new (setting attributes)         28.540000   0.680000  29.220000 ( 29.271775)
Nested::Model.new (setting attributes) 29.740000   0.580000  30.320000 ( 30.486210)

After:                                        user     system      total        real
Model.new (instantiation)                 0.120000   0.000000   0.120000 (  0.121249)
Nested::Model.new (instantiation)         0.150000   0.010000   0.160000 (  0.152429)
Model.new (setting attributes)           11.480000   0.170000  11.650000 ( 11.656163)
Nested::Model.new (setting attributes)   11.510000   0.210000  11.720000 ( 11.724249)

Make the identity map use the instrumentation infrastructure so we can style the messages nicely with colors (FIXME: Can someone look into why the test is not working?)

Remove schema noise from logging (TODO: Deprecate/remove the name attribute to all these methods -- will take a pull request!)

Assign protected attributes with create/new and control the role.

removed the default_scope deprecations and updated the docs and tests to 

singular and collection relations in AR can now specify mass-assignment security options (:as and :without_protection) in build, create and create! methods.

Re-factored database.rake to allow Jdbcpostgresql. #jruby

RDoc autolinks the word "Rails" to the doc page for the Rails module.
But README.rdoc is displayed in the home page at GitHub and the slashes
are visible there, which is weird. We leave by now the slashes off in
the file, and generate a second file for the API with them.

Conflicts:
	railties/guides/source/contributing_to_ruby_on_rails.textile

Prototype and Scriptaculous are no longer vendored, but provided by prototype-rails from now on, also the -j option of the application generator is removed

Removed so info about assigning to specific devs and adding tags.  I don't believe that you can do that in GitHub issues.  Remove state:committed notes as they also don't exist in GitHub issues.