Fix: pagenation error in search result
Add: search problem by author name
Add: page keywords and description for SEO
Fix: it's 2011...
Fix: sql injection bug in problem code
Fix: check if requested image is really in image directory
Fix: compile error on new gcc version
Fix: incorrect handling in select syscall
Fix: compile issue in new gcc
Merge branch 'master' of github.com:licheng/zoj