weave: package improvements

[ruseinov]

Fixes #492

[codecov-io]

Codecov Report

Merging #634 into master will decrease coverage by <.1%.
The diff coverage is 50%.

@@           Coverage Diff           @@
##           master   #634     +/-   ##
=======================================
- Coverage      69%    69%   -0.1%     
=======================================
  Files         171    171             
  Lines        9216   9219      +3     
=======================================
  Hits         6365   6365             
- Misses       2116   2119      +3     
  Partials      735    735

Impacted Files	Coverage Δ
store/iavl/adapter.go	75% <0%> (-3.1%)	⬇️
abci.go	63.2% <80%> (ø)	⬆️

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[ethanfrey]

Nice