use memcache for blog and permalink pages
slightly improve code readability
improve code organization

Created routes.py so all URL routing is now done in one place. Separated
unrelated applications into their own folders - so now all blog-related
python files are in the directory blog and rot13.py is in the directory
rot13. Also created a utils folder that contains code used by all
applications - namely handler.py
Merge branch 'dev'