Merge pull request #10 from ualerts-org/ACE-23

Ace 23
Removed runtime scope from jackson dependencies
Changed Message date to Date type
Introduced DateTimeService to set the message date when message received
Updated javascript to display message date from a unix timestamp
Escaped message text to prevent javascript/html injection
Cleaned up imports
Merge remote-tracking branch 'origin/ACE-23'
Removed the "username has entered the chat message" (for now)
Rearrange ChatController methods. Remove connection() from index.js.

ACE-29