.aliases: Remove npmjs.eu reference

See the deprecation notice: http://npmjs.eu/

Closes #448.
adding git pull/push aliases for upstream and github
Merge branch 'master' of https://github.com/mathiasbynens/dotfiles

* 'master' of https://github.com/mathiasbynens/dotfiles:
  .aliases: Remove npmjs.eu reference
removing redundant alias