Implement text file preview

[tsl143]

Current system supports only upload preview for image files. It will be nice if we can put preview for text files too.

[Quozzo]

I'd like to take this.

[tsl143]

https://github.com/tsl143/fileUploader/blob/master/dist/script.js#L103 here, we read uploaded file as url.
Refer to https://developer.mozilla.org/en-US/docs/Web/API/FileReader#Methods, to read file as text.

[Quozzo]

Thanks, I'll take a look.