Adding .jar and .scr files

JAR - java and friends' executable.
SCR - Windows script executable, commonly used in "screenshot" trick.

config.sample.js

@@ -35,11 +35,13 @@ module.exports = {
 
 	// Add file extensions here which should be blocked
 	blockedExtensions: [
+		'.jar',
 		'.exe',
 		'.msi',
 		'.com',
 		'.bat',
 		'.cmd',
+		'.scr',
 		'.ps1',
 		'.sh'
 	],