Add some logging - to start things off

[ZanderAdam]

Creates 2 loggers:
main - logs anything from watch
payout - creates new log file whenever payout is triggered. Format example: 20180211-133501.log

NOTE
First time working with python. I was also unable to test generate.py as I could not get the stellar.db up and running. So not sure how well the payout logger will work when its actually triggered.

[ZanderAdam]

Test failing on python 3.4. Not sure how you guys want to handle that so I've left it be.

[texm]

Doesn't seem to output properly on my end, here's a snippet:

2018-02-27 13:36:34,416 [MainThread  ] [DEBUG]                  \Created Payment %(paymentOp)s
2018-02-27 13:36:34,416 [MainThread  ] [DEBUG]                  Building Transaction...
2018-02-27 13:36:34,420 [MainThread  ] [DEBUG]                  Transaction Created
2018-02-27 13:36:34,420 [MainThread  ] [DEBUG]                  %(transaction)s

Also I believe the test error is due to the lack of a logs/ folder.

If you'd like I can send you a sample stellar.db file I've been using for testing?