updated comments on server.js
started using Winston to produce our logs.
writing logger timestamp in local time
added winston logger for sever.js

- server.js logs using winston library.
- added routes that returns, in plain text, the last 40 lines of logs.
one for each file:
‘/log/dataGrabber’
‘/log/server’
added guards for log messages

log messages are not being written repeatedly. a log is only written if
the last log was different.
Merge branch 'node.js-dataGrabber'