Add dom open context.
Add dom file system.
Add dom execute context.
Convert to axiom errors. Misc cleanup.
Add domfs utility functions.
Merge branch 'file_system_dom' into mine_file
documentation cleanup.
Initial "argSigil" support.

This uses Perl-ish sigils to declare the type of argument expected
by executables.  Sigils can be one of "$@%*", to signify string,
array, object, or any as the expected arg type.

This helps remove some boilerplate type checking from executables,
and makes it easier to parse shell input in an intelligent way.
Fix error syntax.
Fix jsDirectory..install of exes with sigils in the name.

Also added some sanity checking to make diagnosis easier in the
future.
Fix createRootFrame, set view content size

* Make createRootFrame return the current root frame if there is
  one.
* Ensure that the view contents are sized to the whole view
  rectangle.
Add readFile function to filesystem api.
Fix bug where dom_open_context was not getting exported.
Implement resolve in dom_file_system.
Fix bug in opencontext binding.
Add readFile implementation.
Fix typo
Export default domfs_util.
make create context sync.
fix bug in file_system readFile.