Add dom file system.
Add cat executable.
Add cp executable.
Mount domfs as a js filesystem.
Remove duplicate license.
Merge remote-tracking branch 'origin/master' into file_system_dom
Addressed comments.
Request storage permission.
Take exe arguments as js objects.
Make mountDomfs a Shellfs class method.
Merge pull request #3 from gaurave/add_cat_cp

Add cat and cp executables