stele v2.0.0 - In-app settings

Implementing in-app settings.

v2 is a big restructure of the application, using React to create a settings page that allows us to save kiosk settings to the standard app folders. This does away with the clunky custom configuration file.

• Implement internal react app for configuration and other non-kiosk user interface.
• Restructure webpack to enable writing our app in ES6
• Implement IPC communication so pass information between the main and render processes
• Improved keyboard shortcuts
• Improved build process for Mac, Windows, & Linux

stele v2.0.0-alpha.1 - Electron based kiosk browser

Alpha release of the kiosk system, using Electron as the base browser environment.

• removes all code from the initial v1 Selenium based system
• include the original work on the electron-wrapper
• rebase against our original fork from the szwacz/electron-boilerplate
• re-implement electron-wrapper functionality in updated webpack based boilerplate system
• Confirmed macOS, Linux, and Windows builds all work.

Alpha release to test out on some other people's setups and until we can get a few issues (#4, #8, #5) finished.