Add a toString to TextMessage so log messages are meaningful
Ex:
DEBUG Message '[object Object]' matched regex //^[@]?Hubot[:,]?\s*(?:PING$)/i/
becomes:
DEBUG Message 'hubot ping' matched regex //^[@]?Hubot[:,]?\s*(?:PING$)/i/
Merge pull request #696 from pulseenergy/master

Add a toString to TextMessage so log messages are meaningful