libraries: Removes unneeded find_package(Qt4)

Qt is already included in the root CMakeLists.

Signed-off-by: Luís Pereira <luis.artur.pereira@gmail.com>
potential solution for #553 - Cpuload: adjust text color with theme
libraries: Removes unneeded cmake_minimum_required(VERSION 2.6)

The minimum required cmake version is already set in the root CMakeLists.

Signed-off-by: Luís Pereira <luis.artur.pereira@gmail.com>
libraries: Removes unneeded include(RazorLibSuffix)

RazorLibSuffix is included in the root CMakeLists.

Signed-off-by: Luís Pereira <luis.artur.pereira@gmail.com>
Merge branch 'libraries-cmake-maint' of git://github.com/luis-pereira/razor-qt (#581)
Theme change makes properties update (issue #553 fix)