add fs-plus dependency; fix edit

lib/ex.coffee

@@ -1,6 +1,6 @@
 path = require 'path'
 CommandError = require './command-error'
-fs = require 'fs'
+fs = require 'fs-plus'
 
 trySave = (func) ->
   deferred = Promise.defer()
@@ -102,10 +102,10 @@ class Ex
     filePath = filePath.trim()
     if filePath.indexOf(' ') isnt -1
       throw new CommandError('Only one file name allowed')
-    buffer = atom.workspace.getActiveTextEditor().buffer
-    filePath = buffer.getPath() if filePath is ''
-    buffer.setPath(getFullPath(filePath))
-    buffer.load()
+
+    filePath = fs.normalize filePath
+    atom.workspace.open(filePath)
+
 
   e: (args...) => @edit(args...)
 

package.json

@@ -15,7 +15,8 @@
     "underscore-plus": "1.x",
     "event-kit": "^0.7.2",
     "space-pen": "^5.1.1",
-    "atom-space-pen-views": "^2.0.4"
+    "atom-space-pen-views": "^2.0.4",
+    "fs-plus": "^2.2.8"
   },
   "consumedServices": {
     "vim-mode": {