Issue#10

Bugfix raised in issue#10, i.e.
"When i creating new user (zfcuser,bjyauthorize,roleuserbridge) i have this error:"
"Table must be a string, array or instance of TableIdentifier."

Factory modified in Module.php to inject config into RoleMapper, and constructor added to RoleMapper to initialise the config so that the insert method would have access to the name of the linker table