moving logging into its own util module

[angela97lin]

Fixes #117

[codecov]

Codecov Report

Merging #119 into master will increase coverage by 0.03%.
The diff coverage is 88.88%.

@@            Coverage Diff             @@
##           master     #119      +/-   ##
==========================================
+ Coverage   93.45%   93.49%   +0.03%     
==========================================
  Files          50       52       +2     
  Lines        1299     1306       +7     
==========================================
+ Hits         1214     1221       +7     
  Misses         85       85

Impacted Files	Coverage Δ
evalml/model_types/__init__.py	100% <ø> (ø)	⬆️
evalml/utils/__init__.py	100% <100%> (ø)
evalml/__init__.py	100% <100%> (ø)	⬆️
evalml/models/auto_base.py	91.35% <82.6%> (-0.15%)	⬇️
evalml/utils/logging_utils.py	95% <95%> (ø)

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[kmax12]

LGTM