Feature/history

[ethanwharris]

Closes #372

[codecov]

Codecov Report

Merging #579 into master will decrease coverage by 0.03%.
The diff coverage is 94.59%.

@@            Coverage Diff             @@
##           master     #579      +/-   ##
==========================================
- Coverage   99.62%   99.58%   -0.04%     
==========================================
  Files          38       38              
  Lines        2908     2917       +9     
==========================================
+ Hits         2897     2905       +8     
- Misses         11       12       +1

Impacted Files	Coverage Δ
torchbearer/callbacks/printer.py	97.91% <100%> (+0.04%)	⬆️
torchbearer/trial.py	99.6% <94.11%> (-0.2%)	⬇️

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