Add new ['hub'](https://hub.github.com/) cheatsheet

cheat/cheatsheets/hub

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+As a contributor to open-source
+-------------------------------
+
+# clone your own project
+$ git clone dotfiles
+→ git clone git://github.com/YOUR_USER/dotfiles.git
+
+# clone another project
+$ git clone github/hub
+→ git clone git://github.com/github/hub.git
+
+# see the current project's issues
+$ git browse -- issues
+→ open https://github.com/github/hub/issues
+
+# open another project's wiki
+$ git browse mojombo/jekyll wiki
+→ open https://github.com/mojombo/jekyll/wiki
+
+## Example workflow for contributing to a project:
+$ git clone github/hub
+$ cd hub
+# create a topic branch
+$ git checkout -b feature
+→ ( making changes ... )
+$ git commit -m "done with feature"
+# It's time to fork the repo!
+$ git fork
+→ (forking repo on GitHub...)
+→ git remote add YOUR_USER git://github.com/YOUR_USER/hub.git
+# push the changes to your new remote
+$ git push YOUR_USER feature
+# open a pull request for the topic branch you've just pushed
+$ git pull-request
+→ (opens a text editor for your pull request message)
+
+
+As an open-source maintainer
+----------------------------
+
+# fetch from multiple trusted forks, even if they don't yet exist as remotes
+$ git fetch mislav,cehoffman
+→ git remote add mislav git://github.com/mislav/hub.git
+→ git remote add cehoffman git://github.com/cehoffman/hub.git
+→ git fetch --multiple mislav cehoffman
+
+# check out a pull request for review
+$ git checkout https://github.com/github/hub/pull/134
+→ (creates a new branch with the contents of the pull request)
+
+# directly apply all commits from a pull request to the current branch
+$ git am -3 https://github.com/github/hub/pull/134
+
+# cherry-pick a GitHub URL
+$ git cherry-pick https://github.com/xoebus/hub/commit/177eeb8
+→ git remote add xoebus git://github.com/xoebus/hub.git
+→ git fetch xoebus
+→ git cherry-pick 177eeb8
+
+# `am` can be better than cherry-pick since it doesn't create a remote
+$ git am https://github.com/xoebus/hub/commit/177eeb8
+
+# open the GitHub compare view between two releases
+$ git compare v0.9..v1.0
+
+# put compare URL for a topic branch to clipboard
+$ git compare -u feature | pbcopy
+
+# create a repo for a new project
+$ git init
+$ git add . && git commit -m "It begins."
+$ git create -d "My new thing"
+→ (creates a new project on GitHub with the name of current directory)
+$ git push origin master