allow js_optimizer.py to run standalone
enable extra_info for standalone js_optimizer.py
generate valid code for segfaulting loads, not assignless aborts
Added FileSystem tracking Support.
Added file closing to the list of tracked events.
Merge branch 'fs-tracking' into new-beta2
Added support for file tracking being used to track when
a file has been written to.
Merge branch 'fs-tracking' into new-beta2

* fs-tracking:
  Added support for file tracking being used to track when a file has been written to.