Pyfnalsnow

* fixes to make user 'guest' work more cleanly without crashing snow-tkt
- __init__.py - CacheQueryOne() now returns None instead of a weird
'value' block
- ticket.py - touch-ups for Requestor Info block
- * snow-tkt - better job of reporting exceptions

* RITM.py - 'unresolved' search in tktFilter() now includes 'pending'.
'open' does not.

Changed

* Incident.py - dropping all of the 'stage' search bits from tktFilter()
because that field doesn't exist in SNOW (it's left over from Remedy-land)
* Converted all scripts and libraries to python 3
* RedHat .spec file now works with epel + python36
* ran all python through flake8 python linter, cleaned it up to match

Dropped

* no longer building for RHEL 6

Added

* CHANGELOG.md - standardizing on a single changelog file

Changed

* Makefile.local - now includes Pypi (pip) bindings
* setup.py, omdclient.spec - re-worked for setuptools instead of distutils.core
* README.md - lots of updates on the path towards real distribution