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Fix issue with release robot, in distribution, usage fails because package in `python27\lib\site-packages` or `/usr/lib/python2.7/site-packages` is not a Git repositiory. Solution is similar to versioneer, write `VERSION` to a module called `version.py`, try to import it and compare it to the dulwich version. If not a match, update the file with the latest tag.

update pvlib-0.4.2 and pvpower tests

- 59 propagate uncertainty for dynamic calculations
- 60 refactor redundancy from static and dynamic calcs
- 61 create extensible calculator class to implement calculate() method
- 62 all layers use Meta for options
- 63 split calculations into separate parameters, treat them separately
in DAG
- 78 model class parameter
- 79 merge PR
- 83 clean up index_registry()

- implement 9 use Parameter class to filter parameters from metaclasses
- new `extras` attribute for parameters
- close 64 separate formulas into Parameters
- calculate uncertainty in percent