Helper function: Added unicode aware HTML decoding function

- Leveraged an open source project phpjs that create self-contained and robust JS code snippets to clone PHP web functions. 
- Some features like feeds drawn text and JSON from external sources. It has been demonstrated that some of the external sources like Facebook, Pinterest, etc may not pay close attention to standard encoding of there data. These helper methods are robust Regex and Hashmap lookups for numeric ( unicode safe ) and entities based escaping. 

- Merging this PR allow for the Facebook fix to french character escaping issues some implementors are experiencing

/cc @LaurentGoderre