New class to allow for grabbing of current NST based on systime and a given offset.

Modified runtime code to stop the Habi Bot during maintenance hours (2am->4am NST)
This should help keep undetected

Offset setting is currently in client.py, should probably be moved to cfg file
Merge pull request #1 from Methrend/master

Class to grab NST and modificaiton to Habi Bot , credits to Methrend