Added .gitignore file.

Signed-off-by: Lukasz Gromanowski <lgromanowski@gmail.com>
Removed contents of build directory.

Removed contents of build directory (automatically created by cmake).

Signed-off-by: Lukasz Gromanowski <lgromanowski@gmail.com>
Remove CMake warning about required cmake version:

"No cmake_minimum_required command is present.  A line of code such as

    cmake_minimum_required(VERSION 2.8)

  should be added at the top of the file.  The version specified may be lower
  if you wish to support older CMake versions for this project.  For more
  information run "cmake --help-policy CMP0000".
This warning is for project developers.  Use -Wno-dev to suppress it."

Signed-off-by: Lukasz Gromanowski <lgromanowski@gmail.com>
Removed unneeded variable (there is already one in Roller class).

Signed-off-by: Lukasz Gromanowski <lgromanowski@gmail.com>
Remove using namespace std; (avoid it unless you have to deal with very long namespaces).

Signed-off-by: Lukasz Gromanowski <lgromanowski@gmail.com>