[WIP] display hours per day on user entries page

This still needs some work but I'm putting it out here to get some feedback, currently looks like this:

![screen shot 2014-06-18 at 12 36 57](https://cloud.githubusercontent.com/assets/749864/3312574/8c768a76-f6d4-11e3-9128-14e6973e0b48.png)

Maybe entries isn't the right place for this and we should have something like `users/jurre-stender/pulse` or `users/jurre-stender/overview` that doesn't include the entries table.

IMO we should have some options: `last week`, `last month`, `last year` and `all time`, and these should filter *all* the charts/data