Usage:

1. http://i.jitsu.top/{path}
   - http://i.jitsu.top/img-original/img/0000/00/00/00/00/00/12345678_p0.png

2. http://i.jitsu.top/{pid}[/{p}]
   - http://i.jitsu.top/12345678    (p0)
   - http://i.jitsu.top/12345678/0  (p0)
   - http://i.jitsu.top/12345678/1  (p1)

3. http://i.jitsu.top/(original|regular|large|medium|small|thumb|mini)/{pid}[/{p}]
   - http://i.jitsu.top/original/12345678   (same as http://i.jitsu.top/12345678)
   - http://i.jitsu.top/regular/12345678/1  (p1, master1200)