Incorporate github commits into project pages

Many projects are worked on by people not attending hack nights, or don't get good updates written up. It would be great to leverage the github API to pull recent commit activity into project pages, both to provide information and to make it easier to tell that projects are live.

(Obviously this only applies to github-based projects, but the reality is that most are.)

未指定任何文件、测试或入口点。查找项目页面的渲染方式以及 GitHub API 访问应放置的位置，然后确定应如何显示最近的 commit 活动；完成标准是：基于 GitHub 的项目页面能够显示有用的最近 commit，同时不影响非 GitHub 项目。

由索引模型根据 Issue 内容生成。