Log Message:
py-pyparsing: updated to 2.4.4

Version 2.4.4:
- Unresolved symbol reference in 2.4.3 release was masked by stdout
  buffering in unit tests.

Version 2.4.3:
- Fixed a bug in ParserElement.__eq__ that would for some parsers
  create a recursion error at parser definition time.
- Fixed bug in indentedBlock where a block that ended at the end
  of the input string could cause pyaprsing to loop forever.
- Backports from pyparsing 3.0.0:
  . __diag__.enable_all_warnings()
  . Fixed bug in PrecededBy which caused infinite recursion
  . support for using regex-compiled RE to construct Regex expressions