added a reset() method as part of resolution for issue #173

Former-commit-id: b07e6a477ebd1b008f9be6f249a531fcb911865a

dependency-check-core/src/main/java/org/owasp/dependencycheck/analyzer/FileTypeAnalyzer.java

@@ -31,4 +31,9 @@ public interface FileTypeAnalyzer extends Analyzer {
      * @return whether or not the specified file extension is supported by this analyzer.
      */
     boolean supportsExtension(String extension);
+
+    /**
+     * Resets the analyzers state.
+     */
+    void reset();
 }