[88] Add keplog.py

[ecalifornica]

This commit is a first pass to resolve #88, converting pyke to more Pythonic logging.

I have diffs ready to migrate the other files to use keplog.py, but the diffs are large and mechanical so I wanted feedback on the approach before moving forward.

[codecov[bot]]

Codecov Report

Merging #189 into master will increase coverage by 0.03%. The diff coverage is 43.24%.

@@            Coverage Diff             @@
##           master     #189      +/-   ##
==========================================
+ Coverage   33.64%   33.67%   +0.03%     
==========================================
  Files          65       66       +1     
  Lines       10468    10505      +37     
==========================================
+ Hits         3522     3538      +16     
- Misses       6946     6967      +21

Impacted Files	Coverage Δ
pyke/keplog.py	43.24% <43.24%> (ø)

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