Fix samples for changes in qml.Object

qml.Object is now an interface, this updates the samples according so
that they keep running.
Merge pull request #10 from oblitum/sync-samples

Fix samples for changes in qml.Object
Allow qml.Changed on unknown values

Otherwise it's hard to create types that work before their
values are added to the engine.
Improved delegate model view example
In-progress Result idea.
Reverted Result. Not enough of an improvement.
Convert int32 to int64 from C++ to Go

This makes writing correct code easier.
int32 => int rather than int64.
Try to fix reported Windows issue (#11).
Better errors on incorrect parameter types

Unfortunately this is a bit hard to put in the test suite
as it is testing a hard crash scenario in the GUI thread.
Better wrapping of values and better errors
Rename ShowWindow as it is used by the Windows API

Slightly better error reporting from C++ would be nice.

Fixes #11.
 examples/qmlscene: fix upstream references to tutorial3
Add private include Qt 5.1.1 on Debian.

Fixes #16.
Merge pull request #15 from dupoxy/master

 examples/qmlscene: fix upstream reference to tutorial3
Engine now implements Common as well.
Support loading images into QML from Go.

Closes #4.
Panic if Call fails.

Closes #12.
Dispatch QML method calls properly.

This was submitted on #12, but after a good while the
details were not sorted out, so here it goes.
Fixed a couple of bugs on color.RGBA handling.