Add license + copyright info on external software.

Add configuration file for license header script.
Change js uglify to keep copyright comments.

license-spec.lua

@@ -0,0 +1,9 @@
+local M = {
+	BASE_PATH = 'js_src',
+	EXCLUDE_FILES = {},
+	PROCESS_FILES = {
+		['js_src/[^/]*%.js'] = 'cstyle'
+	},
+	IGNORE_GIT_CHANGED = false
+}
+return M