Add new logger types; Implement LoggerManager as an EventEmmiter; Filter logs by level; Improve log layout

Allows better matches on markdown formatted urls

Added check on username according to app settings for name validation.

Switched new files to .js instead of .coffee;

Only require smtp host to be present. And include username and password if they are provided.

No need to reload server for SMTP settings to take effect;
Closes #1246
Checks SMTP Settings in #1492