Added method to get the command to execute
Parameterized showLogo with the logo to show
The handler calles the command
Added dependency on BundleUpdater
Calling the parameterized method
Defined the default command

It's the "About Eclipse" command
Defined a job to check for updates

It's quite a long running thing, I don't want to hold up just so it can
figure out if there is an update. I can change the icon later if I need
to.
Removed unneeded assert
Imports...
Removed unused methods
Scheduling the job to do the check
Some methods are synchronized now

To avoid concurrency issues