Edited Issue: Consider re-implementing fast model diff via hashing [659]

We would need to devise a smarter hashing algorithm as our previous naive one had problems:<br /><br />1) It included unimportant attributes like providerName/manifestToken.<br />2) Model element ordering is not deterministic due to platform differences.<br /><br />We may not need to do this after making the differ lazy.<br /><br />The hash order independence sounds similar to what we need for the hash over the model for pre-generated views (see http://entityframework.codeplex.com/workitem/606).