Added method bodies for Config and two constructors.

Config should now work as inteded, except for using external dictionary files.
Time also isn't working since it's not implemented.

Added two constructors -- one for Board using an InputStream and a boolean about
being a torus; another for Alphabet using an InputStream and adding all the
first letters from all lines, bag configuration files should work with that.

Added one bag configuration file with standard polish scrabble letters.