Started the refactoring work on couchrest.

* A server can have multiple defined available databases set to be used by documents (think DM repos)
* A server can have a default database so documents can easily share the same db connection
* Let a document class have a default database to use
* Give access to a document uri
* extracted some of the document features to a mixin

spec/couchrest/core/server_spec.rb

@@ -0,0 +1,34 @@
+require File.dirname(__FILE__) + '/../../spec_helper'
+
+describe CouchRest::Server do
+  
+  before(:all) do
+    @couch = CouchRest::Server.new
+  end
+  
+  after(:all) do
+    @couch.available_databases.each do |ref, db|
+      db.delete!
+    end
+  end
+  
+  describe "available databases" do
+    it "should let you add more databases" do
+      @couch.available_databases.should be_empty
+      @couch.define_available_database(:default, "cr-server-test-db")
+      @couch.available_databases.keys.should include(:default)
+    end
+    
+    it "should verify that a database is available" do
+      @couch.available_database?(:default).should be_true
+      @couch.available_database?("cr-server-test-db").should be_true
+      @couch.available_database?(:matt).should be_false
+    end
+    
+    it "should let you set a default database" do
+      @couch.default_database = 'cr-server-test-default-db'
+      @couch.available_database?(:default).should be_true
+    end
+  end
+  
+end