Revert "[Fix #242] Remove hub"

This reverts commit ccf181379a.

modules/git/hub.zsh

@@ -0,0 +1,15 @@
+#
+# Adds GitHub knowledge to the Git command.
+# https://github.com/defunkt/hub
+#
+# Authors:
+#   Chris Wanstrath <chris@wanstrath.com>
+#   Sorin Ionescu <sorin.ionescu@gmail.com>
+#
+
+if (( $+commands[hub] )); then
+  function git {
+    hub "$@"
+  }
+fi
+

modules/git/init.zsh

@@ -15,4 +15,5 @@ pmodload 'helper'
 
 # Source module files.
 source "${0:h}/alias.zsh"
+source "${0:h}/hub.zsh"