Update pyparsing dependency to 2.0.1

Go ahead and require the version of pyparsing that supports
python 2 and 3.

Change-Id: Icdeb7c4a4aeaab9fcc4a44b091a068f91553adf6
add pypy test env configuration

Change-Id: Iff4023d0078b7c1ac38396725f314f44e2ab2ffc
Merge pull request #48 from dreamhost/pyparsing-update

Pyparsing update