Added two additional test cases for disk versioning and replaying.  They're the same test cases as previous, but their config files say to use disk versioners.
Fixes bug with version singleton initialization from properties file: had been illegally casting string to int.  Needed to parse string to int.
Added debugging line of code --- should always be able to find CommitMetadata associated with different version.  Currently can't.
Previously, had not been saving commit metadata.  Now am.
Had not been actually registering endpoint constructor objects.