pages: fixed cached data when `url_cache` is used: `request.template_data` and `request.data` where cached using a shallow copy, causing trouble when a mutable object was used. This has been fixed by using a deepcopy, which should not be a resource issue as `request.data` and `request.template_data` should contain a few data in most cases.

syntax: glob
*.pyc
*.pyv
*.swp
*.swo
*.js
tags
twistd.log
twistd.pid
sat.egg-info
*.un~
dist
MANIFEST
*.sh
build/
Session.vim
ctags_links/
html/