Remove es print

[Seth-Rothschild]

Removes unused class_from_dtype function in variable.py and the file print.py.

[codecov-io]

Codecov Report

Merging #143 into master will increase coverage by 0.69%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #143      +/-   ##
==========================================
+ Coverage   91.19%   91.88%   +0.69%     
==========================================
  Files          73       72       -1     
  Lines        7764     7704      -60     
==========================================
- Hits         7080     7079       -1     
+ Misses        684      625      -59

Impacted Files	Coverage Δ
featuretools/variable_types/variable.py	92.36% <ø> (+10.65%)	⬆️

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[kmax12]

Great! Merging