[MRG] Add option to pass pdfminer kwargs

[vinayak-mehta]

Fixes #170.

[codecov-io]

Codecov Report

Merging #232 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #232      +/-   ##
==========================================
- Coverage   87.94%   87.93%   -0.01%     
==========================================
  Files          13       13              
  Lines        1410     1409       -1     
  Branches      333      333              
==========================================
- Hits         1240     1239       -1     
  Misses        114      114              
  Partials       56       56

Impacted Files	Coverage Δ
camelot/utils.py	81.25% <ø> (ø)	⬆️
camelot/handlers.py	82.5% <100%> (ø)	⬆️
camelot/io.py	100% <100%> (ø)	⬆️
camelot/parsers/stream.py	91.05% <100%> (-0.05%)	⬇️
camelot/parsers/base.py	100% <100%> (ø)	⬆️
camelot/parsers/lattice.py	89.06% <100%> (-0.06%)	⬇️

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