had to revert some changes to get back to compiling well

  - added a new constructor for cmd_velocity.h
Close to v1.0 ... extensive changes

  - added get_ptr(int) to Clearinghouse in order to get access to
the pointer in the messages vector from a message id
  - added some todos to Clearinghouse as well
  - added publish_by_id to Publisher
  - added update_by_id to Subscriber
  - completed functioning example of a whisker and bumper controller
with danger close suppport
  - added gw_bare_minimum template to /examples
  - added multi-bumper example to highlight how to construct
multiple nodes that subscribe to the same message type
Merge branch 'glow_worm2'

Conflicts:
	clearinghouse.h
	examples/wb_controller_example/wb_controller_example.ino
	messages/bumper.h
	messages/cmd_velocity.h

Merged glow_worm2 into master to consolidate changes prior to v1.0 tag
Version 1.0

  - implemented on Alfred and works as designed.
  - represents a significant advance in my publish/receive framework