Make listener,logger,unicorn static libs on unix:!mac

The only Linux app is the scrobbler, so there's no point in creating
private shared libraries for it.  Now linux users don't need to
fiddle with LD_LIBRARY_PATH.

Yay.
On linux, rename the scrobbler binary to lastfm-scrobbler
Add icons for the scrobbler
Add a desktop file too
'make install' now works on linux

e.g. qmake PREFIX=/usr/local; make install
Include translations when running make / make install
Ensure we only have one instance of the application open by ID instead of application location. This means we should never get two of the same app open at once. Fingers crossed.
Merge branch 'master' of github.com:lastfm/lastfm-desktop
Add more linux dependencies

And general updates to readme. Needs someone with more knowledge to sort out installation on linux, whether all the linux deps are also windows ones, etc.
Merge pull request #16 from jstamp/install

Install
Merge pull request #18 from Timmmm/patch-1

Add more linux dependencies