Feature: Error notifier

[jwu910]

NEW:
CIO should have a notification bar or popup (can be discussed), that will display when we want to notify users about something.

We should introduce a new interface that can accept the notification as text. This would create a very fluid experience while using CIO. This interface could potentially handle errors and even loading text

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We should gracefully handle errors and notifications. When CIO errors, we should print it to the screen via blessed object.

We can utilize the blessed dependency to render a small popup when there is an error w/o crashing CIO. This should allow the user to still make use of CIO even though they may have an error like being unable to fetch due to limited connectivity.

Example use-case:

• User attempts to press [r] to refresh their branch list, but the git request is unable to complete.
• CIO should print to screen a message stating that CIO was unable to processes the refresh at this time, and the user can continue to use CIO.

This error notifier should lay the foundation to refactor the error handling in CIO.

Edit: Add details
Edit2: Update scope

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[jwu910]

#280 Will use this issue to manage this. Notifier should handle all messages, not just errors.