Move config flags into config file.
ansi: fix bug that looping in the SkipOne state.
Remove trailing spaces in push line content.
article: fix XSS vulnerability in meta lines.
pttweb/article: case-insensitive match for image suffixes.
article: move css classnames into a separate file.
pttweb: static file serving.

- Serve static files (located in TemplateDirectory/static)
- Function for templates accessing static file prefix.
- Config for static files prefix.
pttweb: cache bbsindex; structure changes.

- Change |params| for template |bbsindex.html| to type |cache.BbsIndex|
pttweb: fix wrong routing regex pattern.
pttweb: more flexible bind address. (able to use unix sockets)
Refactor caching system.
Handle errors from cache manager.
More verbose error on no article content.
Add support for viewing over18 boards. Will ask to confirm age for each session.
Show not found page for non-exist file.
Restrict acceptable redirect URIs.
Fix cache data not saved to memcache.