Merge pull request #4 from medinakrivic/master

aaa
New constructor, minor code fixes
Cities CRUD
Change in CRUD logic, every table has it's own corresponding class
JavaFX library added in ibu.com.fx package
Added Educators class
Added Class for Educators and StudentGrades (Siki pogledaj samo student grades
Merge pull request #5 from sakibk/master

Educators CRUD