more work on the presentation for sessions 4 -- plus a coulple typo corrections for session 2 -- we may want to use this again!
added solution to rot13 assignment
updated session 4, and added script to build gh-pages
made buld script executable
added directions for the homework
final (?) version of session 4
slight update to homework
Added dictionary to switch between user selections
Added exception for numeric input and functions to write letters to a file
session2 homeworks are ready to commit
Changed string formatting to .format method
Merge branch 'dict_set_lab' into exceptions
Added exception for IOError in opening file
mailroom with dict, but has some bugs
most of session 5 complete
rearranging, messy code
finished session 5
mailroom rearranged, haven't tested
Replace donor_list with donor_dict and use dict methods for first ~60 lines
cleaned up homework a bit

added some solutions to the code directory