added demo of app.py, ref-server
Merge branch 'hw5-wsgi' of https://github.com/ctb/cse491-serverz into hw5
Initial changes to implement WSGI app spec for hw5
Refactored page-specific functions to one 'retreive_page' function
Added image and text functions + WSGI capability for hw6
Fixed testing for new image/file pages and templating
Fixing testing of post requests and invalid requests
Fixed all tests for post handling
Merge pull request #6 from zhopping/hw6

Hw6