feat(serveStatic): serveStatic option pass-through

[JLHwung]

Close #34

[coveralls]

Coverage remained the same at 94.34% when pulling 4a7de1b on add-serve-static-support into 0ac5cd5 on master.

[NoahDragon]

LGTM.

[s25g5d4]

It doesn't work; I tried with latest v0.3.1. Say I have a page called about-me, and its path is /about-me.html. Now I try to access that page by url /about-me, and because in

hexo-server/lib/middlewares/route.js

Line 19 in 248d39d

var data = route.get(url);

the server cannot find the /about-me route, it will then redirect user to /about-me/ in the following code of same file (L23~L30). Such path will make serve-static consider that about-me is a directory, and won't try to resolve the file by appending extensions.

I removed the route middleware by commenting out this line

hexo-server/index.js

Line 30 in 248d39d

hexo.extend.filter.register('server_middleware', require('./lib/middlewares/route'));

and it worked as intended.

怕上面表達不夠清楚，再用中文說明一次
假設我有個 page 叫 about-me，而我希望可以用 /about-me 存取到這個 page，但因為

hexo-server/lib/middlewares/route.js

Line 19 in 248d39d

var data = route.get(url);

查不到 /about-me 這個路徑，再接下來的程式碼 (23~30 行) 會把頁面重新導向到 /about-me/，而這個路徑是查不到東西的。同時也會造成 serve-static 認為 about-me 是一個資料夾，而不會自動加上副檔名搜尋檔案。