w3 in progress: homepage w/ template now done.

Added other html templates, especially entry-template.
blogpost_dao.clj added and working.
w3 in progress. Post display w/ comment handling in place.
w3 in progress. Refactored post.clj to be cleaner and fewer redirects
w3 in progress: added newpost.clj - handles displaying blank form.

Still need to add handling when new post form is submitted.
Refactored escape method to be in separate util ns/file, since
it was being used in most handler ns's.
w3 completed. Matches functionality of example app.

This includes the bug that a logged in user sees the blog
posts of all users on the blog home page.  Will probably
fix this next week even if the course examples don't.