[MRG] Add table bbox attribute

[vinayak-mehta]

Closes #186.

[codecov-io]

Codecov Report

Merging #193 into master will increase coverage by 0.02%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #193      +/-   ##
==========================================
+ Coverage    87.3%   87.32%   +0.02%     
==========================================
  Files          13       13              
  Lines        1252     1254       +2     
  Branches      297      297              
==========================================
+ Hits         1093     1095       +2     
  Misses        109      109              
  Partials       50       50

Impacted Files	Coverage Δ
camelot/parsers/stream.py	92.57% <100%> (+0.04%)	⬆️
camelot/parsers/lattice.py	89.52% <100%> (+0.05%)	⬆️

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