Added first/last/all aliases for equivalent find scopes

Just a copy from Active Record (with tests). Each is a warpper function for
the equivalent scoped call to find eg first is a wrapper for find(:first)

Signed-off-by: Joshua Peek <josh@joshpeek.com>

activeresource/lib/active_resource/base.rb

@@ -611,6 +611,28 @@ def find(*arguments)
         end
       end
 
+
+      # A convenience wrapper for <tt>find(:first, *args)</tt>. You can pass
+      # in all the same arguments to this method as you can to
+      # <tt>find(:first)</tt>.
+      def first(*args)
+        find(:first, *args)
+      end
+
+      # A convenience wrapper for <tt>find(:last, *args)</tt>. You can pass
+      # in all the same arguments to this method as you can to
+      # <tt>find(:last)</tt>.
+      def last(*args)
+        find(:last, *args)
+      end
+
+      # This is an alias for find(:all).  You can pass in all the same
+      # arguments to this method as you can to <tt>find(:all)</tt>
+      def all(*args)
+        find(:all, *args)
+      end
+
+
       # Deletes the resources with the ID in the +id+ parameter.
       #
       # ==== Options

activeresource/test/cases/finder_test.rb

@@ -126,18 +126,56 @@ def test_find_all
     assert_equal "David", all.last.name
   end
 
+  def test_all
+    all = Person.all
+    assert_equal 2, all.size
+    assert_kind_of Person, all.first
+    assert_equal "Matz", all.first.name
+    assert_equal "David", all.last.name
+  end
+
+  def test_all_with_params
+    all = StreetAddress.all(:params => { :person_id => 1 })
+    assert_equal 1, all.size
+    assert_kind_of StreetAddress, all.first
+  end
+
   def test_find_first
     matz = Person.find(:first)
     assert_kind_of Person, matz
     assert_equal "Matz", matz.name
   end
 
+  def test_first
+    matz = Person.first
+    assert_kind_of Person, matz
+    assert_equal "Matz", matz.name
+  end
+
+  def test_first_with_params
+    addy = StreetAddress.first(:params => { :person_id => 1 })
+    assert_kind_of StreetAddress, addy
+    assert_equal '12345 Street', addy.street
+  end
+
   def test_find_last
     david = Person.find(:last)
     assert_kind_of Person, david
     assert_equal 'David', david.name
   end
 
+  def test_last
+    david = Person.last
+    assert_kind_of Person, david
+    assert_equal 'David', david.name
+  end
+
+  def test_last_with_params
+    addy = StreetAddress.last(:params => { :person_id => 1 })
+    assert_kind_of StreetAddress, addy
+    assert_equal '12345 Street', addy.street
+  end
+
   def test_find_by_id_not_found
     assert_raise(ActiveResource::ResourceNotFound) { Person.find(99) }
     assert_raise(ActiveResource::ResourceNotFound) { StreetAddress.find(1) }