[MRG] Add more configuration parameters

[vinayak-mehta]

Fixes #229, #230 and #233.

• strip_text: To define characters that should be stripped from each string.
  • code
  • test
  • doc
• edge_tol: Tolerance parameter for extending textedges vertically.
  • code
  • test
  • doc
• resolution: To define resolution ghostscript will use to convert PDF to PNG.
  • code

[codecov-io]

Codecov Report

Merging #234 into master will decrease coverage by 0.43%.
The diff coverage is 91.11%.

@@            Coverage Diff            @@
##           master    #234      +/-   ##
=========================================
- Coverage   87.93%   87.5%   -0.44%     
=========================================
  Files          13      13              
  Lines        1409    1416       +7     
  Branches      333     333              
=========================================
  Hits         1239    1239              
- Misses        114     121       +7     
  Partials       56      56

Impacted Files	Coverage Δ
camelot/io.py	100% <ø> (ø)	⬆️
camelot/parsers/lattice.py	89.17% <100%> (+0.11%)	⬆️
camelot/core.py	91.35% <100%> (-2.31%)	⬇️
camelot/cli.py	85.58% <100%> (+0.4%)	⬆️
camelot/parsers/stream.py	91.66% <80%> (+0.61%)	⬆️
camelot/utils.py	81.25% <91.66%> (ø)	⬆️

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