Add webpack into the build process

[ztl8702]

As part of #34

[ztl8702]

臨時 dev build 步驟

gulp serve::dev

Production build is currently broken. I suggest we wait until the migration is finished to fix production builds.

[ztl8702]

現有問題：

點擊播放按鈕無法播放聲音。

Console logs:

Error: t._sounds is undefined
play@http://localhost:3000/all.min.js:3:6950
DetailsCtrl/$scope.playButtonClicked@http://localhost:3000/app.bundle.js:183:21
fn@http://localhost:3000/all.min.js line 1 > Function:4:484
e@http://localhost:3000/all.min.js:1:56716
i@http://localhost:3000/all.min.js:1:129617
$eval@http://localhost:3000/all.min.js:1:66277
$apply@http://localhost:3000/all.min.js:1:66509
compile/</<@http://localhost:3000/all.min.js:1:129667
Vt@http://localhost:3000/all.min.js:1:13671
n@http://localhost:3000/all.min.js:1:13620

Fixed: 這是由於 howlerjs 的API變了。

[ztl8702]

I have added TypeScript to the build process, and it seems to work (can build and serve with gulp serve::dev). Tell me if there are any issues.