Add Project.open, which returns a buffer for an absolute/relative path.

src/atom/project.coffee

@@ -1,4 +1,5 @@
 fs = require 'fs'
+Buffer = require 'buffer'
 
 module.exports =
 
@@ -8,3 +9,12 @@ class Project
   getFilePaths: ->
     fs.async.listFiles(@url, true)
 
+  open: (filePath) ->
+    new Buffer(@resolve(filePath))
+
+  resolve: (filePath) ->
+    if filePath[0] == '/'
+      filePath
+    else
+      fs.join(@url, filePath)
+