Better testing mocks and environment for private test networks

[lsaether]

The ability to correctly test contracts is super important for avoiding expensive fiascoes. However, there is no easy way to mock / test the scheduling functionality of the Ethereum Alarm Clock on a private test network besides actually deploying the contracts first. Even then, the private network requires a TimeNode to be present to actually execute the transaction. For a better developer experience we need a way to mock the deploy of the EAC on private test networks and execute the transactions in a lightweight way.

One thing we can do is create a dumb Scheduler which will basically only be a TransactionRequest with a timelock, then have a lightweight TimeNode in a helper function exposed by this library. Something like mockSchedule(params) which will handle all the complicated stuff under the scenes. Or even a simple mockTimeNode() which will wrap over the execution. Add't we can add an easy deployEAC() function which can be ran early in a Truffle mocha test.