Convert options to function arguments

[flimzy]

Alternative implementation of #673

[codecov]

Codecov Report

Patch coverage: 73.54% and project coverage change: +0.04% 🎉

Comparison is base (a28a046) 82.88% compared to head (611a43e) 82.93%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #679      +/-   ##
==========================================
+ Coverage   82.88%   82.93%   +0.04%     
==========================================
  Files          83       85       +2     
  Lines        9003     9022      +19     
==========================================
+ Hits         7462     7482      +20     
+ Misses       1331     1329       -2     
- Partials      210      211       +1     

Files Changed	Coverage Δ
couchdb/chttp/options.go	0.00% <0.00%> (-64.52%)	⬇️
couchdb/test/session.go	0.74% <0.00%> (ø)
driver/driver.go	100.00% <ø> (ø)
options.go	27.27% <27.27%> (ø)
mockdb/gen/render.go	54.27% <46.15%> (-1.41%)	⬇️
mockdb/dbexpectations_gen.go	65.95% <57.58%> (+3.44%)	⬆️
mockdb/clientexpectations_gen.go	61.26% <69.36%> (+1.99%)	⬆️
couchdb/options.go	71.42% <71.42%> (ø)
mockdb/common.go	80.00% <77.77%> (-0.77%)	⬇️
couchdb/db.go	80.24% <81.48%> (-0.36%)	⬇️
... and 27 more

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