v3.1.0-RC1 - Beta Badger

Fixes several bugs in 3.0.0 including (but not limited to)

• Failed logins are reported as successful
• Split notification:mention event into notification:mention and notification:group_mention events
• Failure for a plugin to load was not reported, leading to confusion

Noteable updates in this merge:

• Misc test fixes from test audit
• update readme for version 3.0
• remove ignored codeclimate folder
• update travis configuration
• release 3.0.0
• fix crash bug on run and add test to catch regressions of crash bug of f6714c09c3c5
• implement group_mention notification type
• adjust configuration validation to include checking for plugin configurations - fixes #293
• detect when plugin fails to load and fail the bot start because of it
• detect failed nodebb login - resolves #294
• release 3.1.0-RC1