Merge pull request #232 from SunLn/12103_add_entrance_for_demo_contest_result

add demo page
chg dn
Merge pull request #233 from forrest-mao/master

chg dn
chg dn again
modify description of avthumb&segtime
Merge pull request #234 from forrest-mao/master

chg some description
test update
Merge pull request #235 from forrest-mao/master

test update
delete status code of rs error body
Update callback.md
add 404 & 478 of fetch & prefetch
add 612
Merge pull request #236 from forrest-mao/master

chg rs status code
fix jquery html inject bug
extract $p