Added 2 new methods to ResultSetImpl to allow compilation under java 7

the interface java.sql.ResultSet has the methods
<T> T getObject(int columnIndex, Class<T> type) throws SQLException
and 
<T> T getObject(String columnLabel, Class<T> type) throws SQLException
in java 7

I have added these to the class com.google.code.hs4j.impl.ResultSetImpl to allow it to compile with java 7.