Code cleanup: Replace BufferChangedCallbacks with BufferObservers (#427)
Fix build (define new methods on non-local type) (#427)
Replace AddCallback to AddObserver in sublime_test (#427)
Run gofmt on code
Merge pull request #447 from MontakOleg/master

Code cleanup: Replace BufferChangedCallbacks with BufferObservers (#427)
Return empty json for settings and keymaps when file doesn't exist or on error
Moved packages from 3rdparty/bundles to packages/