Change keyboard animation curve
close #29
fix #20
Merge pull request #36 from VladiMihaylenko/fixed-EXC_BAD_ACCESS

fix #20
- remove setter method attribute from BOOL properties
- change it to dot syntax
Merge pull request #37 from wiruzx/dot-syntax

- remove setter method attribute from BOOL properties
Merge pull request #35 from wiruzx/keyboard-animation

Change keyboard animation curve