Optimize load time

[zimme]

I would suggest you use activationCommands in package.json to make sure the package isn't activated until one of the commands are run for the first time.

Right now this package adds 82ms to load time, which isn't much in itself but adds up with other packages.

[unional]

After a more detailed look, I think the activationCommands needed is open-project or open-file. One of the feature atom-perforce provides is to show the client name in the status bar. That will and should be available for any file opened.

I don't know about the actual activationCommands names, as I can't find any documentation about them.

@mattsawyer77 , any idea?