Config: Notifications:{ enabled: is ignored. Always treated as true. #276

Description

Setting notifications>enabled to false and restarting the server does not prevent emails from being sent.

Steps to Reproduce

1. Start with a working config.json from an example.
2. Set up notification information with a notification server.
3. Leave valid information, but set "enabled" value to false, as so:

"notifications": {
"enabled": false,
"email": {
"host": "smtp.gmail.com",
"port": 587,
"user": "TheGmailBeingUsed@gmail.com",
"password": "gmailpassword",
"fromAddress": "whatever",
"fromName": "Test Pool"

Expected behavior

No emails are sent when blocks are discovered, etc.

Actual behavior

Emails are still delivered just the same as when enabled:true

Reproduces how often

100%

Version

v21 release and also the head dev build as of 3/18/2018.