Reorganise properties for lib versions
Create Helpers to run with the EventBuilder
Add builder helpers to the Raven instance
Remove the method sendEvent(EventBuilder)

This method is counter intuitive and breaks the idea of having an
immutable Event sent to Raven
Run builderHelpers before building the event
Add a builder helper to extract HttpRequests

Use a ServletRequestListener to capture an HttpServletRequest and a
BuilderHelper to extract the ThreadLocal content when building the
event.
Initialise BuilderHelpers
Rename LoggedEvent in Event
Use the naming convention when naming constants
Make the timeout a constant in AsyncConnection
Fix indentation and import order
Add documentation to Raven.java
Improve documentation
Add logs to the Raven client
Add Hamcrest library for unit tests
Add unit tests for Raven