Extracted the DocumentListener into a variable
Added equals and hashCode for the DocumentListener

The thing that keeps track of them uses these to check for object
equality. Figured this from the code, not the documentation, as
usual.
Keeping track of the documents and the listeners I registered

Because "IDEA" can't give you that info... And if you try to register
the same listener twice, it will log an error, throw an uncatchable
Throwable and... still registers the listener.

Because hey, if I have an error, let's just keep going... What could
possibly go wrong?
Protecting myself from null documents

It happens if you open a document from the .cope folder. Shouldn't
affect outside people, but better safe than sorry.
Updated the submodule so it builds
Merge branch 'refs/heads/submodule-update'
Merge branch 'refs/heads/master' into snapshot-fix
Merge pull request #20 from caiusb/listener-fix

Listener fix
Using a FileFilter to remove the .cope folder from the snapshot

This also solves the freezing issue.
Merge pull request #21 from caiusb/snapshot-fix

Snapshot fix
Merge branch 'master' of github.com:ChangeOrientedProgrammingEnvironment/intellijRecorder into installation

Conflicts:
	recorderInfra