Revert "Merge pull request #304 from bricker88/nil_for_per"

This reverts commit 38fb04fab3, reversing
changes made to 992fb9f935.

Conflicts:

	README.rdoc
	spec/models/active_record/scopes_spec.rb

README.rdoc

@@ -62,10 +62,6 @@ Then bundle:
   To show a lot more users per each page (change the +per_page+ value)
     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.
-  
-  If you would like to specify "no limit" while still using the +per+ scope, you can pass +nil+:
-    User.count                 # => 1000
-    User.page(1).per(nil).size # => 1000
     
   Keep in mind that +per+ utilizes internally +limit+ and so it will override any +limit+ that was set previously
     User.count                  # => 1000

lib/kaminari/models/page_scope_methods.rb

@@ -3,9 +3,7 @@ module Kaminari
     # Specify the <tt>per_page</tt> value for the preceding <tt>page</tt> scope
     #   Model.page(3).per(10)
     def per(num)
-      if num.nil?
-        limit(nil)
-      elsif (n = num.to_i) <= 0
+      if (n = num.to_i) <= 0
         self
       elsif max_per_page && max_per_page < n
         limit(max_per_page).offset(offset_value / limit_value * max_per_page)

spec/models/active_record/scopes_spec.rb

@@ -58,11 +58,6 @@ if defined? ActiveRecord
             it { should have(5).users }
             its('first.name') { should == 'user001' }
           end
-
-          context "page 1 per nil" do
-            subject { model_class.page(1).per(nil) }
-            it { should have(model_class.count).users }
-          end
         end
 
         describe '#padding' do