Some functions added while some are modified
1. findByName is modified to return list of objects rather than one
object as it results in error if more than one row with same name
exists.
2. insert is modified to return integer which will be the number of rows
affected by the operations. 
3. log4j.properties modified to append the log to a file
4. test case is created for JdbcstudentDaoImpl but it is not fullproof
and may be removed in future.