Fixes to compile on Mac OS X 10.9 + Qt 5.3

These are the fixes I had to make to compile on Mac OS X 10.9 (Mavericks) + Qt 5.3.  Introduces native notifications for Mac which do not depend on Growl being installed.  Also fixes alignment for clang++ compiler.  Not including my .pro file as it is, unfortunately, heavily modified and very specific to my system.  Client currently syncing with network.  Changes should have no effect on windows/unix builds.  These changes are from upstream litecoin.