I'm specifically interested in pull requests, editing issues and tying them to commits, and other things I generally have to use hub on the command line for. However, I've started using magit and really like the keybindings and general interface---I'd like to stay in emacs for this part, too, rather than needing to keep an extra shell open for pull requests, issues, etc.
The packages that might add the most github functionality to magit that I could find are:
Eventually I will implement such things in Magit (I am the maintainer), but I first have to get a release out.
Unfortunately there currently also isn't a third-party extensions that could fill this role.
magithub has been broken for a long time now.
magit-gh-pulls (by Yann, my predecessor as Magit maintainer) also wasn't kept in sync with the changes in Magit. I tried to fix it up some time ago, but gave up when it became clear that doing so would result in a complete rewrite .
gh.el is also written by Yann and is used by
magit-gh-pulls. I have contributed to it in the past but eventually stopped using it because (a) it uses
url.el and that turned out to be very unreliable (b) it's over complex.
So I am afraid there currently isn't a package that does what you want. If you want to write it yourself, I recommend you use
request.el and then only implement those parts of the Github api that you actually need, to avoid over-engineering it.
Edit: As of October 2015
magit-gh-pulls is maintained again, but no longer an official extension. Personally I don't use it, as I think it should either to more or less. I currently use "less" in the form of
magit-branch-pull-request from the my
magit-rockstar library. Even though I maintain that library, I do not consider it an official extension - it's provided as-is. That function is very basic, you give it an issue number and it creates a branch for you, that's it.
Edit in September 2016: I have written
glab.el as replacements for
gh.el. They are mostly intended for my own personal use and provide very little, basically they give you functions such as
ghub-get (resource &optional params data noerror), you then have to look at the respective api documentation to figure out what
data you have to use. Also the error handling isn't great and this currently uses
url.el. I intend to improve both eventually by using
libcurl some time after an Emacs with ffi support has been released.