add search of job types to seminar API.
POST prams are as follows:
-for_engineer: 0 or 1
-for_designer: 0 or 1
-for_director: 0 or 1
-for_sales: 0 or 1
-for_marketing: 0 or 1
-for_corporate_staff: 0 or 1
-for_others: 0 or 1