[enhancement] local file support scenarios

Hi,

First of all, the chrome extension of JSONEditor is very easy to use. Thanks a lot!

(https://chrome.google.com/webstore/detail/json-editor/lhkmoheomjbkfloacpgllgjcamhihfaj)

There are 4 interesting scenarios that I'm currently using with other json editors, and I think the JSONEditor could really shine here.

1) Support for local JSON files using the url file:///C:/projects/elevatezoom-plus/bower.json

2) Support for opening by command line the JSON file:

"C:\Program Files (x86)\Google\Chrome\Application\chrome.exe" --profile-directory=Default --app-id=lhkmoheomjbkfloacpgllgjcamhihfaj bower.json

3) Shortcut CTRL-S, for saving of opened local file that was previously opened, no dialogs required or needed.

4) and finally, the killer feature (very productive workflow):
Idea would be that, if I'm in any other application (reallly anywhere) where there is some JSON text.
Via a short cut using TextEditorAnywhere, we can open the JSON file using JSONEditor and upon saving the local file, that any-other-application gets the json text updated. (this is done automatically by TextEditorAnywhere, which simply expects the local file is saved.)