Test each license file does not begin with byte order mark

Fixes #328

spec/license_bom_spec.rb

@@ -0,0 +1,16 @@
+require 'spec_helper'
+
+describe "license file" do
+
+  bom = "\xEF\xBB\xBF".each_byte.to_a
+
+  files = Dir["_licenses/*.txt"]
+
+  files.each do |fn|
+    first3 = File.open(fn) {|f| f.read(3)}
+
+    it "#{fn} should not have a byte order mark" do
+      expect(first3.each_byte.to_a).not_to eq(bom)
+    end
+  end
+end