Cosmetics and idiot-proffing

Updated docstrings.
Renamed files to be more friendly.
Now salt is named "beta password" and master password - "alpha password.
Everytime while trying to open a file, errors are handled.
Some cosmetic changes for more readability.
Added separate functions for creating files.
Files' names are now stored in class.
Updated version to 0.1.1-alpha.

Author: AnonymousX86