1) Calls to the growl SDK were not made in a thread safe manner
2) Loading the icon from a URL did not work in mono, and it made
the GrowlService calls take exceptionally long
3) The result of the growl SDK calls was not checked
4) A bug in the growl for windows SDK caused the mono version
on unix platforms to not work. A fixed version of the SDK is
now included in the build (do not use the NuGet version, it's
broken on unix). The bug was reported to growl for windows here:
https://code.google.com/p/growl-for-windows/issues/detail?id=48
use var for locals
made requested changes from code review
Gave state class a better name
e752e7f35d