Support specifying address to deploy from

[abcoathup]

Support specifying address to deploy from, e.g. deployProxy(..., {deployer, from: accounts[1]})

Truffle uses the default account (accounts[0]) for deployProxy in tests and migrations and there doesn't appear to be a way to specify a from option (unless this is part of the Deployer object).

Raised in the community forum: https://forum.openzeppelin.com/t/setting-the-from-address-for-a-proxy-deployment-in-a-test/3821

[frangio]

Duplicate of #85.