Rename variables to avoid collisions
Delete unnecessary code.
clean up tests: fixing warnings and clean up issues
Use constructor argument for config URL.

Leaving method setConfigurationUrl() in place, as it is used in
HornetQFileConfigurationService, which is necessary for AS4 support.
We should determine that in HORNETQ-1107.
delete unused helper classes
Remove some methods from Transaction interface.
Merge pull request #756 from FranciscoBorges/smallFixes

Small fixes that accumulated while revising paging locks