Select employees method was changed
* All methods , which needed select of employees query were also changed
* Unnessecary DAO class was removed (SelectSingleEmployeeDao)
* Search result's fail page button was changed
* Salary information page style was changed
* Unnessecary image was removed
* Save employee's editing result button was changed
Employee dao refactoring.

Refactor result set parsers.
Change logging.
Controller validation.
Add apache commons maven dependency.
Merge pull request #8 from hemiSRT8/mainPageSortTypeFeature

Select employees method was changed