[MRG] Add table regions support

[vinayak-mehta]

Fixes #209.

[codecov-io]

Codecov Report

Merging #243 into master will decrease coverage by 0.15%.
The diff coverage is 89.28%.

@@            Coverage Diff             @@
##           master     #243      +/-   ##
==========================================
- Coverage   87.49%   87.33%   -0.16%     
==========================================
  Files          13       13              
  Lines        1463     1492      +29     
  Branches      341      346       +5     
==========================================
+ Hits         1280     1303      +23     
- Misses        124      129       +5     
- Partials       59       60       +1

Impacted Files	Coverage Δ
camelot/io.py	100% <ø> (ø)	⬆️
camelot/utils.py	80.44% <ø> (ø)	⬆️
camelot/image_processing.py	86.48% <100%> (+1.19%)	⬆️
camelot/cli.py	86.32% <100%> (+0.73%)	⬆️
camelot/parsers/lattice.py	89.75% <100%> (+0.47%)	⬆️
camelot/parsers/stream.py	88.11% <45.45%> (-2.61%)	⬇️

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