fix escaping characters for psql

double quotes(") need to be escaped in the parsed text for COPY FROM to work
properly. current implementation had an issue as it's only escaping `"` if the
string contains `\` otherwise not. This test was resulting in failure of COPY
FROM statements with `"` with no `\`.

parser/src/main/scala/com/clearcut/nlp/DocumentParser.scala

@@ -75,7 +75,7 @@ class DocumentParser(props: Properties) {
       if (x.contains("\\")) 
         "\"" + x.replace("\\", "\\\\\\\\").replace("\"", "\\\\\"") + "\""
       else 
-        "\"" + x + "\""
+        "\"" + x.replace("\"", "\\\\\"") + "\""
       ).mkString("{", ",", "}")
   }