Updated JEC and Type 1 MET uncertainties

Updated JetTransformer with extended capabilities:

• Calculates type1 met uncertainties
• Calculates jes uncertainies by individual source

Spark executor + flake8

Adds a simple interface for using spark resources, enforces conformity with flake8.

Backwards incompatible histogram changes

v0.4.0

rachet version

re-sync versions and tags

Wherein Lindsey remembers to be fastidious about version numbers....

Accumulator fix

Wherein Nick learns about literals in python.

Processing Framework Ideas / multiprocessing & spark compatibility

Also includes numba update to lumisection processing.

v0.2.5: Merge pull request #63 from CoffeaTeam/topic_housekeeping

Reduce numba requirement and move numba into util

Plotting Enhancements / Bugfixes

v0.2.4

rachet version up

Improvements for python3

Merge pull request #55 from CoffeaTeam/topic_python3_pain

Make things better in python3 by quite a lot.

Update uproot-methods

Merge pull request #54 from CoffeaTeam/topic_uproot_methods_order

Update to uproot-methods 0.4.3