Simplify tabular API

[pelillian]

[codecov[bot]]

Codecov Report

Merging #43 into master will decrease coverage by 1.18%. The diff coverage is 97.41%.

@@            Coverage Diff             @@
##           master      #43      +/-   ##
==========================================
- Coverage   94.13%   92.94%   -1.19%     
==========================================
  Files           7        7              
  Lines         358      326      -32     
  Branches       58       53       -5     
==========================================
- Hits          337      303      -34     
  Misses         12       12              
- Partials        9       11       +2

Impacted Files	Coverage Δ
src/dowel/simple_outputs.py	96.92% <100%> (+2.37%)	:arrow_up:
src/dowel/tensor_board_output.py	94.5% <100%> (-1.06%)	:arrow_down:
src/dowel/logger.py	94.18% <100%> (+0.51%)	:arrow_up:
src/dowel/csv_output.py	95.23% <91.66%> (-2.14%)	:arrow_down:
src/dowel/tabular.py	94.11% <94.11%> (ø)

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