Cleaned up comments
Added an import for code testing.
Changed the fram size and the window size for the Camera Display.
Defined exposure and gain function, still need to write them.
Cleaned up qtbasic2
Added exposure and gain property in cameradevice
framesize modified in camerawidget to fit on screen
Merge pull request #2 from wang15k2/master

qtbasic2 cleaned up, cameradevice added exposure and gain properties, camerawidget framesize changed to fit entire camera display on screen