Fixes #13 by removing a superfluous line and catching encoding problems.

 * Updated the documentation to point out that it will now expect
   ASCII and UTF8 only files. This is not *really* true es it might
   actually work fine on whatever the native Windows encoding is.
   But that is for somebody else to figure out.
 * When an illegal encoding is discovered the *ttws* will now simply
   terminate with a pointer to what was wrong.
 * I removed the reference to v0.4 since that was badly broken ;-)