#257 Detect dual mit or gpl in javascript

src/licensedcode/data/rules/mit_or_gpl_syntax_highlighter.RULE

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+Dual licensed under the MIT and GPL licenses.

src/licensedcode/data/rules/mit_or_gpl_syntax_highlighter.yml

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+licenses:
+    - mit
+    - gpl
+
+license_choice: yes

tests/licensedcode/data/licenses/mit_or_gpl.js

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+/**
+ * SyntaxHighlighter
+ * http://alexgorbatchev.com/SyntaxHighlighter
+ *
+ * SyntaxHighlighter is donationware. If you are using it, please donate.
+ * http://alexgorbatchev.com/SyntaxHighlighter/donate.html
+ *
+ * @version
+ * 3.0.83 (July 02 2010)
+ * 
+ * @copyright
+ * Copyright (C) 2004-2010 Alex Gorbatchev.
+ *
+ * @license
+ * Dual licensed under the MIT and GPL licenses.
+ */
+eval(function(p,a,c,k,e,d){e=function(c)

tests/licensedcode/data/licenses/mit_or_gpl.yml

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+licenses:
+    - mit
+    - gpl
+license_choice: yes