Do:
- implement pattern command and factory
Version has some bugs:
- buttons in iOS 6
- the sequence of calculations
- commands for all operations
- to remove switches (finish commands factory)
- UNSET_OP
- crash
Do:
- implement pattern command and factory
Version has some bugs:
- buttons in iOS 6
- the sequence of calculations
- commands for all operations
- to remove switches (finish commands factory)
- UNSET_OP
- crash
Merge pull request #2 from eugene0785/master

review, refactoring and migration to command factories
.
.
fix:
- bottoтs in iOS 6
- sequential calculation
- commands for all operations
- to remove switches (complete commands factory)
- UNSET_OP