Add README and utility scripts
NSA 3.5a3rc201211032306

From http://noscript.net/nsa/latest/noscript-3.5a3rc201211032306.xpi

Last-Modified: Sat, 03 Nov 2012 22:06:11 +0000
File size: 187085 bytes

md5: de0c8484ba466760e7af35a54fb4fd12
sha256: 7c6fa685358620a49bbc730a43e56d9e661eb2adf114eae7930ed8f83d1aea96
NSA 3.5a4rc201306082147

From http://noscript.net/nsa/latest/noscript-3.5a4rc201306082147.xpi

Last-Modified: Sat, 08 Jun 2013 19:48:00 +0000
File size: 187702 bytes

md5: 7c8b44412015b1d3a0fd93b8938d4ef0
sha256: 8609437e2f11aec2e00d2dbe2654e402ff21ece54923455abfd1d8ad5c40b52b