Merge pull request #63 from ernstchan/minor-changes

No HTML entities in URLs
Update style.css
Update kaiserchan.css
Update leet.css
Update style.css
Update leet.css
Update kaiserchan.css
JSON is natively supported

 in every browser worth supporting.
Remove prototype.js
Groundwork for context feature
Remove unused plugin
Update jquery
Update jquery plugins
Fix after jquery updates
Multiple stylesheets
context.js: add working prototype
context.js: highlight posts
context.js: add hover preview
Global stylesheet phutaba.css for all boards. Optional board-specific stylesheet in config.pl.
Merge pull request #64 from ernstchan/multiple-css

Multiple stylesheets