Added GetColorHex() function to the openshot::Color class, which returns a Hex string of a color at any frame number. Added new "hash" and "changed" properties to the openshot::Clip Properties JSON method, to help a UI determine if something has changed in the property values. Lastly, added new unit tests for both classes.

src/examples/Example.cpp

@@ -42,7 +42,6 @@ using namespace tr1;
 
 int main(int argc, char* argv[])
 {
-
 	// Reader
 	FFmpegReader r9("/home/jonathan/Videos/sintel-1024-surround.mp4");
 	r9.Open();