Adds a github status check for inline todos

The module automatically creates a html page and uploads it to s3.

``bash


on master branch

github-todo-status push-base \
--base=master \
--s3.key=key \
--s3.secret=secret \
--s3.bucket=bucket

on pr branch

github-todo-status check \
--base=master \
--s3.key=key \
--s3.secret=secret \
--s3.bucket=bucket \
--github.token=token \
--github.user=user \
--github.repo=repo \
--github.sha=sha
``

TODO:
- Filter for files in the current pull request and group them
- Write tests