Allow switching to blob caching using a query string (#898)
Allow switching to blob caching using a query string (#898)

Fix mozilla/thimble.mozilla.org#2563

* Added code that checks the URL for a parameter that enables the memory-backed fs

* Fixed a small bug: '===' instead of '=='

* Removed some FORMAT flags, cleaned the code

* Changed the query parameter to TemporaryStorage

* Update documentation

* Fix indentation

mozilla/brackets,mozilla/brackets,nucliweb/brackets,nucliweb/brackets,mozilla/brackets,nucliweb/brackets,nucliweb/brackets,mozilla/brackets,nucliweb/brackets,mozilla/brackets