- Fix memory leak
 - Add zlib support for winsparkle
 - Download and update program from FeedUrl
 - Run download on new thread
 - Execute download on new thread
 - Change the icon of winsparkle
 - Skip write to file if file already exists
 - Fix Release build setting
 - Change the download file directory to updates
 - Project build for VC10
- Change Winsparkle link with zlib and minizip static
- Fix windows vista/7 no right to create file problem
- update checking logic
- Add debug testing info
Merge branch 'master' into develop

Conflicts:
	.gitignore
	3rdparty/WinSparkleDeps.sln
	3rdparty/wxWidgets
	WinSparkle.sln
	include/winsparkle.h
	src/dll_api.cpp
	src/ui.cpp