Developer Tools Import/Export Snippet for Google Chrome

This new functionality,also discussed with @paulirish in bgrins/devtools-snippets#28, is ready to pull from my end.

I tested it in chrome stable and chrome canary (both on Windows XP).

See 
https://github.com/anaran/devtools-snippets/blob/master/snippets/devtools_import_export/README.md#step-1
for a poor man's slide show.

Regards,
Adrian