Fixed atom plugin for cygwin users

plugins/atom/atom.plugin.zsh

-local _atom_paths > /dev/null 2>&1
-_atom_paths=(
+if [ Cygwin = "$(uname -o 2>/dev/null)" ]; then
+    local _atom_path > /dev/null 2>&1
+
+    _atom_path=${LOCALAPPDATA}/atom/bin/atom
+
+    if [[ -a $_atom_path ]]; then
+        cyg_open_atom()
+        {
+            if [[ -n $1 ]]; then
+                ${_atom_path} `cygpath -w $1`
+            else
+                ${_atom_path}
+            fi
+        }
+
+        alias at=cyg_open_atom
+    fi
+else
+    local _atom_paths > /dev/null 2>&1
+
+    _atom_paths=(
         "$HOME/Applications/Atom.app"
         "/Applications/Atom.app"
-)
+    )
 
-for _atom_path in $_atom_paths; do
+    for _atom_path in $_atom_paths; do
         if [[ -a $_atom_path ]]; then
             alias at="open -a '$_atom_path'"
             break
         fi
-done
+    done
+fi
 
 alias att='at .'