Custom JS Scripts in Batches/Scheduler and Bugfixes

Added

• Append custom scripts to run during or after schedule or batch [#48]
• Node module require('databridge') documentation added to README [#35]

Changed

• Tests don't require user input - use timing and mock-stdin to simulate user input [#27]
• Added instructions at the end of setup.js for oracledb installation [#44]

Fixed

• Spinner stops on error in console [#49]
• Tests don't throw error when there are no batches in local installation [#38]