Add QIRTranslator type

src/qir/driver/DBDriver.java

src/qir/driver/IQIRVisitor.java

src/qir/driver/QIRTranslator.java

src/qir/driver/hbase/HBaseDriver.java

src/qir/driver/hbase/QIRHBasePredicateVisitor.java

src/qir/driver/hbase/QIRHBaseQueryVisitor.java

src/qir/driver/hbase/QIRHBaseValueVisitor.java

src/qir/driver/sql/OracleDriver.java

src/qir/driver/sql/PostgreSQLDriver.java

src/qir/driver/sql/QIRHiveDriver.java

src/qir/driver/sql/QIRSQLStringVisitor.java