This commit addresses the following PR changes
- Variant calculation is moved to the correct location (_monitorSpecial)
- findHashProperty has been integrated into parseProductPageForHash
- parseProductPageForHash has been completed and debug logs are added
- dsmParser run method has been implemented to store the hash
- addToCart form parameters have been adjusted to just accept an
  optional hash
- addToCart checkout method now passes the hash along to form method

This commit fixes a bug that prevented DSM US from performing the
hash property calculation. Cheerio Parsing bugs have also been
fixed to get the script text properly.