Fix @see links in documentation

All of the deep links in the docs (`@see http://`) are 'broken', because the API
docs redirect all `http` to `https`, breaking the deep links:

- http://developer.github.com/v3/#authentication becomes
  http://developer.github.com/v3

This commit simply mass-find-and-replaced all the `@see http://` with `@see
https://`. I checked a few but not all.
Merge pull request #462 from catsby/https_docs

Fix @see links in documentation