Add documentation for Key.
Add documentation for key parser.
Update documentation of KeyConfigurator.
Add documentation for KeyValidator.
Add documentation for RuleMaker.
Add documentation for SymbolConfigurator.

From SymbolConfigurator removed getFirstSymbolKey() method.
In this case I understand mistake in implementation of getFisrtKey().
So I change it to return first key according min length of key.
Remove default type for Character of KeyConfigurator.
Add documentation for SymbolRun.
Add documentation for SymbolValidator.