Backbone.dualStorage support from ie8?

[kidhui]

the same to title

[nilbus]

Run the test suite on IE8, and that should tell you. Please report any
issues you find. I'm not sure if IE8 supports localStorage or only
sessionStorage, which this plugin does not use.

There is talk in #73 of using an abstraction layer on top of the storage
mechanism so that we can support methods other than localStorage.

[kidhui]

thank you

[nilbus]

It might be useful to others if you report back what you find. Thanks!