Adding will_paginate gem

Signed-off-by: Rodrigo Dias Ferreira <rodrigodias@gmx.de>
Adding pagination feature

Signed-off-by: Rodrigo Dias Ferreira <rodrigodias@gmx.de>
Refactoring to compact code with partial model: @users

Signed-off-by: Rodrigo Dias Ferreira <rodrigodias@gmx.de>
Adding admin feature

Signed-off-by: Rodrigo Dias Ferreira <rodrigodias@gmx.de>
Adding Delete by admin feature

Signed-off-by: Rodrigo Dias Ferreira <rodrigodias@gmx.de>