[MRG] Add implementation of Anssi Nurminen's table detection algorithm

[vinayak-mehta]

Closes #102.

• Add implementation
• Update tests
• Fix comments
• Add docstrings
• Update docs

Paper: http://dspace.cc.tut.fi/dpub/bitstream/handle/123456789/21520/Nurminen.pdf?sequence=3

[codecov-io]

Codecov Report

Merging #206 into master will increase coverage by 0.58%.
The diff coverage is 92.74%.

@@            Coverage Diff            @@
##           master    #206      +/-   ##
=========================================
+ Coverage   87.32%   87.9%   +0.58%     
=========================================
  Files          13      13              
  Lines        1254    1372     +118     
  Branches      297     324      +27     
=========================================
+ Hits         1095    1206     +111     
- Misses        109     113       +4     
- Partials       50      53       +3

Impacted Files	Coverage Δ
camelot/__version__.py	76.47% <63.63%> (-23.53%)	⬇️
camelot/parsers/stream.py	91.97% <75%> (-0.6%)	⬇️
camelot/core.py	93.65% <98.96%> (+2.05%)	⬆️

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