fixed some typo's. LUA_LIBRARY now points to the right name, regardless of the host machine. Running cmake after a bad attempt (ie forgot to add paths to PATH) now works rather than having to clean the cache

#include <QtGui/QApplication>
#include "mainwindow.h"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();
    return a.exec();
}