Fix for changes to data binding UI lag as per issue #83

This contains my changes to fix the UI lagging when updating observable arrays connected to kendoui widgets.  The initial problem was very noticeable when working with the grid, or with dropdown lists that contain a large number of members.  All I did was add a throttle to the computed observable.  I had to change the test suite as well to allow for a little extra time before checking values.

I appreciate that there might be a better solution, or that it might be better to allow for this to be set as an option, however this fixes the problem for me and I have not noticed any issues with it.

I accidentally included the build files in this commit.  Apologies for that.

Cuinn.