Max/log head

[max-hoffman]

• Single commit repos failed on dolt.log()
• dolt.log does not constrain results to working HEAD
• python 3.6 support

[codecov-io]

Codecov Report

Merging #130 (9c83867) into master (1c51ac6) will increase coverage by 0.20%. The diff coverage is 68.75%.

@@            Coverage Diff             @@
##           master     #130      +/-   ##
==========================================
+ Coverage   42.69%   42.89%   +0.20%     
==========================================
  Files          25       25              
  Lines        1710     1718       +8     
==========================================
+ Hits          730      737       +7     
- Misses        980      981       +1     

Impacted Files	Coverage Δ
doltpy/sql/sql.py	0.00% <0.00%> (ø)
doltpy/cli/dolt.py	53.83% <75.00%> (+0.39%)	:arrow_up:
doltpy/types/dolt.py	70.13% <100.00%> (ø)

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[oscarbatori]

LGTM