updated innosetup cover image
ifdef out call to Qt 5.4 function QSysInfo::prettyProductName() when compiling with Qt < 5.4
Merge branch 'develop' into bitshares

Conflicts:
	images/inno_setup_img.bmp
	images/splash_screen.jpg
Use centered splash screen from downstream
Merge branch 'develop' into bitshares
Merge branch 'bitshares' of github.com:BitShares/qt_wallet into bitshares

Conflicts:
	images/inno_setup_img.bmp