Setting up for session 4
Updated s4 notes and stringlab 4.1
Updated dict lab to 4.4
Posting work from class
Improved dict creation with d.update
Finished dict_set_lab.py for session04 homework.
class notes modified
python compiled program
added exception lab
Uploading revised mailroom, class labs
	modified:   .gitignore
	new file:   Students/ebuer/introtopython.sublime-workspace
	new file:   Students/ebuer/session_04/mailroom/junk.py
	new file:   Students/ebuer/session_04/mailroom/mailfuncs.py
	new file:   Students/ebuer/session_04/mailroom/mailroom.py
	modified:   Students/ebuer/session_04/readme.txt
	new file:   Students/ebuer/session_04/safe_input.py
Changing readme format
Completed Files lab v 1.0
Modified mailroom after reading solution to be better.
Finishing up OSlab
finished files lab.
First version of Kata Homework.
kata now builds a usable dictionary
Merge branch 'master' of https://github.com/UWPCE-PythonCert/IntroToPython into session4
Update readme.md
Update readme.md