Fix some ancestry functions

examples/parse.js

@@ -8,4 +8,4 @@ console.log(psd.header.export());
 //   console.log("Finished!");
 // });
 
-console.log(psd.tree().children[0].export());
+console.log(psd.tree().children[0].children[0].nextSibling().export());
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lib/psd/nodes/ancestry.coffee

@@ -11,12 +11,12 @@ module.exports =
     return [] if not @parent? or @parent.isRoot()
     return @parent.ancestors().concat [@parent]
 
-  hasChildren: -> @children().length > 0
+  hasChildren: -> @children.length > 0
   childless: -> not @hasChildren()
 
   siblings: ->
     return [] unless @parent?
-    @parent.children()
+    @parent.children
 
   nextSibling: ->
     return null unless @parent?
@@ -31,12 +31,12 @@ module.exports =
   hasSiblings: -> @siblings().length > 1
   onlyChild: -> not @hasSiblings()
 
-  descendants: -> _.flatten @children().map((n) -> n.subtree())
+  descendants: -> _.flatten @children.map((n) -> n.subtree())
 
   subtree: -> [@].concat @descendants()
 
   depth: -> @ancestors().length + 1
 
   path: (asArray = false) ->
-    path = @ancestors.map((n) -> n.name).concat([@name])
+    path = @ancestors().map((n) -> n.name).concat([@name])
     if asArray then path else path.join('/')
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