Export API

[cgewecke]

This...

const API = require('solidity-coverage/api');
const api = new API();

const config = {
  workingDir: process.cwd(),
  contractsDir: path.join(process.cwd(), 'contracts')
  artifactsDir: path.join(process.cwd(), 'artifacts')
} 

const {
  targets,
  skipped, 
} = api.utils.assembleFiles(config)

const instrumented = api.instrument(targets)

Also makes api.report's output folder path configurable as an fn argument.

[codecov-io]

Codecov Report

Merging #445 into buidler-plugin will increase coverage by <.01%.
The diff coverage is 100%.

@@                Coverage Diff                 @@
##           buidler-plugin     #445      +/-   ##
==================================================
+ Coverage           99.21%   99.22%   +<.01%     
==================================================
  Files                  18       19       +1     
  Lines                 768      772       +4     
==================================================
+ Hits                  762      766       +4     
  Misses                  6        6

Impacted Files	Coverage Δ
plugins/resources/plugin.utils.js	97.26% <ø> (ø)	⬆️
lib/api.js	100% <100%> (ø)	⬆️
api.js	100% <100%> (ø)

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