Update hive.py

Added a time offset checking with ntplib.
Update hive.cfg.dist

Checking if the time is accurate . By default it is disabled.
Update hive.cfg.dist

Renaming cap_timecheck to [timecheck].
Update requirements.txt

python ntp module added to requirements list .
Update hive.py

Added a new function to do all the time checking and spawn the function with arg ( self ) .The newly created thread is appended to the thread list.
Merge pull request #30 from adarshdinesh/master

Check if time is accurate