Improve file watcher behavior

[veosotano]

I have only tested this on Mac. What happens is that when you open an xml or hss file, the first time you make a change to that file and save, it reloads. But then, unless you restart the app, it doesn't do it anymore.

Another thing is that when opening an xml file, for example, and you make a change to the linked hss file, it doesn't do anything either.

[jakepetroules]

I think this is related to another issue where we were talking about an AXRDocument could have an AXRController for each file it has loaded (xml, hss 1, hss 2). So, when you load a document, it can report back its URLs so the watcher can watch them.

The refreshing is due to TextMate, which somehow bypasses the normal saving mechanism.

This is also a browser issue and should be moved.

[veosotano]

The file watcher behavior improved with axr/browser@e9e313b, although now it shows annoying messages in the OS console each time it refreshes.