Add devtron devDependency, minor cleanup for src/index.js

Update styles for ProjectViewer

Add storybook for ProjectViewer

Add stories for RepositoryDiff

Add support for react-storybook.

OAuth integration with Github, attach auth token to outbound service requests.

Clean up console.log, add index to ./containers, set up initial plumbing for login flow and route.

Dependency updates, fix npm warnings

Add nvmrc to avoid versioning issues.

Dependency updates.

Only send a diff when someone is @mentioned.

Store most recent diff hash, only send diffs when code has changed between sessions.

Reorder token replacement for better JSON object parsing

Rough hack at messages view.

Add redux-persist dependency, migrate away from config-based reducer for initial app state.