Change URI.encode to CGI.escape

Hello, johnnyhalife!

I could not upload some files which include "[" or "]" in their names.

ex)
[en]English.txt
[ja]日本語.txt

This happens by using "URI.encode" at "WAZ::Storage::SharedKeyCoreService#execute".
I change this using CGI.escape and it works well.

Could you merge this pull request, please?

Cheers!