Calculator #1
Added second task
Added Shell back on.
Added shell-specific exception class.
Calculator, fixed version 2
Added synchronizing with double checker for ShellReceiver singleton.
[Shell] Modified IO restrictions.
[Shell] Replaced Vector usages with ArrayList.
[Shell] Refactored 'cd' command implementation.
First commit, Drozdowsky
shell ver.1
Калькулятор

Внес исправления
[Shell] Fixed exception type.
[Shell] Merging arguments for cmd launch to let single command components be passed as different arguments.
Shell version 2
Shell ver.2
Shell ver.2 (fixed little bugs)
Shell ver.3 (formatting code)
Shell ver.3 (cp <dir\file> <dir> fixed)
Исправил парсинг аргументов