Simple revision server refactoring.

- Moving it into its own package.
- Adding some basic unit tests.
- Adding JSR330 to the classpath and annotating the constructor.
Renaming 'my' to 'default.'

The name "My*" is rather nondescriptive.  This change updates it to use Default instead,
which is not a lot more descriptive, but helps distinguish "MyRevision" as a documentation
example from "MyRevision" the actual class.
Making a static map immutable.

- Replacing instances of static map construction with Guava's ImmutableMap.
Cleaning up headers and generics.

- Removing unused imports.
- Minor tweaks to use of generics.
First stab at reducing visibility of member variables.

Per Effective Java, Item 13: "Minimize the accessibility of classes and members."

This commit marks the member variables `private` that look like they can be made that way.
Merge pull request #45 from dclements/simple

SimpleRevisionServer refactor + Minor cleanup