Show more button v2

Before:
![screen shot 2014-10-13 at 17 23 48](https://cloud.githubusercontent.com/assets/2579465/4630512/d7764526-53ad-11e4-9656-c3b00970a49d.png)

After:
![screen shot 2014-10-13 at 17 23 35](https://cloud.githubusercontent.com/assets/2579465/4630518/dcf161b6-53ad-11e4-8cc3-08d4f6f88f5e.png)

Show more button is now moved to the pasteup-buttons.

What's next: I will move all of these `show more` buttons to pasteup-buttons and pasteup-palette.

Great catch. I actually missed that icon is styles as class `.i` that I thought that I need to override it the hard way.

Anyway. As for my button I need smaller icon than is the default for these show more buttons I am using specific class to change it's size. 

Just think out loud. Do we want to do sizes of icons in the new pasteup-icons too? icon-something--small, icon-something--medium or do we want to do it locally (if we need different size)?