will_paginate and kaminari pagination methods and tests

#### Pagination Additions
##### kaminari
  - Added alias: 'limit_value' -> 'per_page' 

##### will_paginate
  - Added out_of_bounds?, next_page, previous_page

Tests were included to cover those attributes discussed in 
will_paginate
https://github.com/mislav/will_paginate/blob/master/lib/will_paginate/collection.rb
kaminari
https://github.com/amatsuda/kaminari/blob/master/lib/kaminari/models/array_extension.rb