bump version for backbone 1.3.x update

[codynguyen]

Hi,

I can see c10e997 changed the backbone dependency to allow >=1.0.0 instead of 1.0.0 - 1.2.1. Can you bump the version to 0.2.6 and create a new release so it can be installed without having to specify the commit in bower.json file?

Thanks a lot!

[osartun]

Unfortunately I'm not entirely familiar with versioning and releases on Github. I did this 9817afb and that: https://github.com/osartun/Backbone.Undo.js/releases/tag/v0.2.6
I hope this was correct?