Refactoring the project.

Refactoring the project.

monteCarloSpatialGrid.cpp ---> main.cpp, utils.cpp, glut_window.cpp.
Changed Makefile (using pkg-config now).
Changed README.
Add COPYRIGHT and .gitigrone.
Added timer.cpp for future speed measure.
![my screenshot](https://f.cloud.github.com/assets/203439/772026/6759aa74-e8f8-11e2-8302-de567d81ffa1.png)