Config file and initial options

[str4d]

Part of #45.

[codecov-io]

Codecov Report

Merging #50 into master will decrease coverage by 0.25%.
The diff coverage is 24.39%.

@@            Coverage Diff             @@
##           master      #50      +/-   ##
==========================================
- Coverage   61.68%   61.42%   -0.26%     
==========================================
  Files          30       29       -1     
  Lines        4259     4298      +39     
==========================================
+ Hits         2627     2640      +13     
- Misses       1632     1658      +26

Impacted Files	Coverage Δ
src/lib.rs	100% <ø> (ø)	⬆️
src/netdb/mod.rs	34.11% <0%> (-0.83%)	⬇️
src/router/mod.rs	0% <0%> (ø)	⬆️
src/router/builder.rs	0% <0%> (ø)	⬆️
src/router/mock.rs	52% <100%> (+2%)	⬆️
src/transport/mod.rs	70.93% <100%> (+1.82%)	⬆️
src/crypto/dsa.rs	65.51% <100%> (ø)	⬆️

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[str4d]

The one failure was due to a GitHub timeout error.