Reference package with full URL
Add newId function to generate a call ID.

See AutobahnPython Clinet implementation for reference:
https://github.com/tavendo/AutobahnPython/blob/master/autobahn/autobahn/util.py#L65
Merge remote-tracking branch 'upstream/dev' into mp-fix_examples
Merge remote-tracking branch 'upstream/dev' into mp-add_client_id_generator
Add callback on session open (WAMP welcome message)
Add example to documentation on how to use NewServer
Add documentation to most of the public API.
Merge branch 'mp-open_session_callbacks' into dev-mp
Merge branch 'mp-add_client_id_generator' into dev-mp

Conflicts:
	client.go
Merge branch 'mp-add_documentation' into dev-mp

Conflicts:
	client.go
	server.go
Fix bug where sessionOpenCallback was missing in struct
Export less methods to the API, fixes #16
Remove dependency on github.com/jcelliott/lumber for logging, fixes #13

This solution will not create any overhead when the debug flag is set
to false as the compiler will optimize all if statements.
See discussion: https://groups.google.com/forum/#!topic/golang-nuts/Qlxs3V77nss
Unify example presentation
Simplify and fix client example
Simplify server example
Simplify server examples
Add basic call return and error functionality.
Add tests for client call return and error functionality.

Could use improvments in the test setup.
Merge pull request #20 from maxpersson/dev-mp

Previous pull requests merged and resolved