Minor update in README
Add gradle wrapper for the greater good
Fix icon access modifier (chmod -x)
SA should not fail when NPE occurs during connection establishment

SWT may fail when we try to pass `null` value instead of message string.
To prevent this, we must check message from exception for nullness
first.
Refactoring: hide command creation implementation inside OS class
Refactoring: pass whole object into Backend
Refactoring: extract UI options from split Platform interface

Platform interface had three methods that returned constant values in
all implemetnations. So they can be extracted into separate class.
Refactoring: remove coupling between Platform and DefaultConfiguration classes
Microfix: move trailing comment up
Refactoring: make GUIOptions even simpler
Use pitest plugin to measure tests quality
Basic RSA/DSA keypair authentication #43

Seems that MindTerm doesn't support RSA/DSA encrypted keys, but for
paswordless keys everything works fine.
RST fix
Fix signature of FileUtils methods
Add some tests on DefaultConfiguration
Remove excessive logging from ConsoleManager

Also fix logger name for this class.
Remove unused constants from ConsoleManager
add new icon
Simple OpeningAccount class
Allow to modify TreeItemController data