RMarkdown in nbconvert, improved option parser

[mwouts]

No description provided.

[codecov]

Codecov Report

Merging #5 into master will increase coverage by 1.42%.
The diff coverage is 98.28%.

@@            Coverage Diff             @@
##           master       #5      +/-   ##
==========================================
+ Coverage   96.06%   97.49%   +1.42%     
==========================================
  Files          15       17       +2     
  Lines         610      718     +108     
==========================================
+ Hits          586      700     +114     
+ Misses         24       18       -6

Impacted Files	Coverage Δ
tests/utils.py	100% <ø> (ø)	⬆️
tests/test_ipynb_to_rmd.py	100% <ø> (ø)	⬆️
tests/test_nbrmd_errors.py	100% <ø> (ø)	⬆️
setup.py	0% <ø> (ø)	⬆️
tests/test_chunk_options.py	100% <100%> (ø)	⬆️
nbrmd/cli.py	93.1% <100%> (ø)	⬆️
nbrmd/nbrmd.py	96.86% <100%> (-0.02%)	⬇️
tests/test_contentsmanager.py	100% <100%> (ø)	⬆️
nbrmd/hooks.py	100% <100%> (ø)	⬆️
nbrmd/nbconvert.py	100% <100%> (ø)
... and 10 more

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