supporting customizing frame and font for iPhone/iPad using @define

맨 윗줄 @define 3줄을 통해서 각 앱에 맞게 커스터마이징이 가능합니다.
Adjusted font size and offset.
Merge branch 'pr/3'
Merge branch 'master' of https://github.com/Joyfl/JLToast