Merge pull request #93 from keep-network/babe-the-blue-ox

Babe the Blue Ox: Add rudimentary buidler setup

This change allows the usage of buidler-vm instead of ganache for testing,
which in turn allows the usage of console.log in contracts.

A special script, buidler-vm:log, filters the buidler VM output to only
log output. This is useful for testing with logs.

Lastly, with ganache gone, its script is updated to note that Ganache
is no longer used, and the Solidity test workflow is updated to use
npm run buidler-vm instead of ganache.

To use logging in a contract, add an import:

import "@nomiclabs/buidler/console.sol";

Then you can use console.log with limited types, and cannot pass
arrays to it directly. See the docs for more.

.github/workflows/solidity-test.yml

@@ -16,7 +16,7 @@ jobs:
       - name: Run tests
         # Runs ganache in background
         run: |
-          npm run ganache & 
+          npm run buidler-vm & 
           npm test
         env:
           CI: true

buidler.config.js

@@ -0,0 +1 @@
+module.exports = {};