Updated the slides with lots of new content

- Reworked the order
- Added a motivation
- Added teh anatomy of a plugin
- Added a section on capabilities
- Added a section on the DB
- Added a section on JGit
Updated the EclipseCon menu to include a link to create work item
updated the message to be more concise
Renamed the change item command

This also refactors the change item command to use the createWorkItem service
Reformat the PrintUptime SSH Command
Created a service for creating work items
Added a GWT Interface for the example
Updated the SSH Module to use the renamed SSH Command
Added a UI Action for creating WorkItems
Added a capability that must be available to create work items
Added an HTTP Module to register HTTP Commands
Added the rest of the examples to the pom and module

The POM now includse
- HTTP, SSH and Core module examples
- a GWT Example