Assignment 1b update.

I've changed the turn-in for assignment 1b slightly:  when you turn-in your
design document, you should use the assignment number "1b.design" (without the
double quotes).  For example

  $ send-files -a1b.design -s design.html
  HTML files sent: design.html

  $

You should use the assignment number "1b" to turn in your modifications to the
first assignment.  If you forget and turn-in your design document using "1b",
you'll get an error message:

  $ send-files -a1b -s design.html
  One of the package directories turned-in for assignment 1b must be called
  "playerAPI" (without the double quotes).  Nothing sent.

  $ 

Using "1b.design" to turn-in changes to the first assignment won't work
either:

  $ send-files -a1b.design -s impl playerAPI
  One of the files turned-in for assignment 1b.design  must be called
  "design.html" (without the double quotes).  Nothing sent.

  $

In sum: turn-in your design document to "1b.design", turn in your code
modifications to "1b".  The assignment page has been updated; let me know if
you have any questions.