switch from web sockets to SSE (ID-243)
to do next: kill tail process upon server exit
refactor log display code (ID-243)
stop using Concurrent.boradcast for showing log file
include txnId in the log when access platform authentication fails
improve twilio's phone call message
add copyright text
add config parameter for verification phone call message
add config parameter for verification phone call message
tweak and improve log messages
log display interface: add autoscroll and clear functions
Merge pull request #10 from securekey/logDisplay

Log display using SSE instead of WebSocket