lab1 code was prepared to lab2
form for calculator was added
ViewModel completed
bind view to viewmodel
Merge branch 'master' of https://github.com/serkos/agile-development-course into lab2-mvvm-polynomial
move error handling to viewmodel
fix warning with tests
fix warning with combobox
Merge pull request #87 from serkos/lab2-mvvm-polynomial

[KK] Коклюев -- Lab2 mvvm polynomial