First commit of file entropy analyzer.

- Code comments need cleaned up still.

scripts/policy/frameworks/files/entropy.bro

@@ -0,0 +1,19 @@
+
+module Files;
+
+export {
+	redef record Files::Info += {
+		## The information density of the contents of the file, expressed as a number of bits per character. 
+		entropy: double &log &optional;
+	};
+}
+
+event file_new(f: fa_file)
+	{
+	Files::add_analyzer(f, Files::ANALYZER_ENTROPY);
+	}
+
+event file_entropy(f: fa_file, ent: entropy_test_result)
+	{
+	f$info$entropy = ent$entropy;
+	}