Log Message:
Update to 1.7.0

Changelog:
New in v1.7.0 (2010-02-26):
* Added CGImage based backend on OS X.
* Added Quicktime based backend for older OS X versions.
* Added GDI+ based backend for Windows.
* Added Jasper/JPEG 2000 support.
* Added Visual Studio project files.
* Added Universal Binary support for OS X.
* Added pkg-config description.
* Added support for Windows 64-bit.
* Fixed QImage backend to work with Qt4.
* Fixed various memory leaks.
* Fixed various build system and compile/link issues.