modify the following issues:
#18 Job seeker profile：Industry 和 position 只能累加保存，不能删除已经保存的
#21 Job seeker profile：Personal Skills 和 Professional Skills 点击save按钮后能保存但是没有保存成功提示信息
#6 因为location的国家只有China，暂时让location默认选择China
Merge branch 'jobseeker-register'

Conflicts:
	application/views/default/jobseeker-register.php