Update for PureScript 0.9.x?

This project uses PureScript 0.7.x, which is a couple of revisions behind now.

One option for "updating" this to 0.9.x would be to leave the code as-is, and just update the README to note that `pulp init` can create a very similar project template, along with minor differences from the current README and blog post. Amongst these are:
- You must now use `pulp psci` to run the interpreter.
- `pulp server` doesn't work with the project created with `pulp init`.
- We now use `bower update` rather than the deprecated `pulp dep update`.

(One might also note how you could re-use files here in the `pulp init` template project to get the server to work.)

根据 PureScript 0.9.x 工作流检查 README 和所引用的博客文章，先从当前的 `pulp init` 模板和列出的命令变更开始。完成的标准是文档准确说明更新后的设置、解释器和依赖项命令、服务器限制，以及服务器所需的任何可复用文件。

由索引模型根据 Issue 内容生成。