Allow programmatic access

[psalmody]

Index.js wrapper could:

• Expose batch runner
• Expose individual bridge
• Expose setup
• Expose list batch / source / destination / tables.

var DataBridge = require('databridge')({
  //setup options or config file
});
var dbBatch = DataBridge.batch;
var dbBridge = DataBridge.bridge;

How would this function with scheduler/service/pm2?

[psalmody]

Need to set main in package.json to a script which exposes bridge and bridge runner and list of installed tables / sources / destinations.