Auto-Tracing HTTP Requests

[XerTheSquirrel]

Implement auto-tracing and measuring of HTTP requests.

For Reference:

• Auto Trace HTTP Requests iopipe-python#210
• Add automatic tracing for HTTP requests iopipe-python#211

[XerTheSquirrel]

This will be very complex to do as Java does not really have a means to support this. So whatever the implementation does is definitely going to use dark magic if it is to be automatic. At least in the mean time #102 would help in the mean time and at least a variation of it.

[XerTheSquirrel]

No longer blocked.