FileDictionaryFactory does not treat lines beginning with '#' as comments

The documentation for FileDictionaryFactory states that "Blank lines and lines that start with a '#' are ignored". This is not the case. When loading a dictionary file with '#' prefixed lines, they just get interpreted as terms and show up in suggestion results.

This causes additional confusion when trying to use payloads. As stated in https://lucene.apache.org/core/6_1_0/suggest/org/apache/lucene/search/suggest/FileDictionary.html : "In order to have payload enabled, the first entry has to have a payload". However, if you happen to have a "comment" as the first line in a dictionary file (that doesn't happen to have two instances of the fieldDelimiter in it...), payloads are disabled.