Merge pull request #18 from kurtulus/ulakbim_egemen

cover and thumbnail fix
Merge pull request #19 from kurtulus/ulakbim_egemen

page delete error fix
Merge pull request #20 from kurtulus/ulakbim_egemen

chapter remove fix
Merge pull request #21 from kurtulus/ulakbim_egemen

graph color box fix
profile fit window fix