Improvement/#43/suppress console log output

[isaacgr]

Add documentation for logger. Refs #43.

Add logger tests. Refs #43.

Simplify class

• add getInstance method to just return the logger instance
• Refs Option to suppress console.log prints for connection failures and messges with no outstanding calls #43

Update console prints in all files to use new logger

Is this a singleton?

• make singleton logger class for library
• uses console by default or can be overwritten in main function
• Refs Option to suppress console.log prints for connection failures and messges with no outstanding calls #43