Adding skip method to skip an arbitrary record count

Can be used in conjunction with page and per to offset by an
amount less than the page size.

README.rdoc

@@ -61,6 +61,12 @@ Then bundle:
     User.page(7).per(50)
   Note that the +per+ scope is not directly defined on the models but is just a method defined on the page scope. This is absolutely reasonable because you will never actually use +per_page+ without specifying the +page+ number.
 
+* the +skip+ scope
+
+  Occasionally you need to skip a number of records that is not a multiple of the page size.
+    User.page(7).per(50).skip(3)
+  Note that the +skip+ scope is not directly defined on the models but is just a method defined on the page scope. This is absolutely reasonable because you can use +offset+ otherwise
+
 === General configuration options
 
 You can configure the following default values by overriding these values using <tt>Kaminari.configure</tt> method.

lib/kaminari/models/page_scope_methods.rb

@@ -12,6 +12,10 @@ def per(num)
         end
       end
 
+      def skip(num)
+        limit(limit_value).offset(offset_value + num.to_i)
+      end
+
       # Total number of pages
       def num_pages
         (total_count.to_f / limit_value).ceil

spec/models/scopes_spec.rb

@@ -55,6 +55,14 @@
     end
   end
 
+  describe '#skip' do
+    context 'page 1 per 5 skip 1' do
+      subject { User.page(1).per(5).skip(1) }
+      it { should have(5).users }
+      its('first.name') { should == 'user002' }
+    end
+  end
+
   describe '#num_pages' do
     context 'per 25 (default)' do
       subject { User.page }