Return real values for getSchemaName, getTableName and getColumnName.

Remove the getBase*Name methods from the PGResultSetMetaData interface.

This brings getColumnLabel and getColumnName in line with the
clarifications to the JDBC API from Java 6.
merge nathanlws: Return real values for getSchemaName, getTableName and getColumnName

Merge pull request #47 from nathanlws/sql-layer-adapter-jdbc/remove-getbase-names
https://github.com/FoundationDB/sql-layer-adapter-jdbc/pull/47