3 new additional button types

Arrow down
![screenshot 2014-09-16 14 27 36](https://cloud.githubusercontent.com/assets/1119565/4293551/252725fc-3dd7-11e4-87e2-5290bd042e18.png)

Simple arrow up
![screenshot 2014-09-16 14 27 34](https://cloud.githubusercontent.com/assets/1119565/4293552/252ccebc-3dd7-11e4-9fd1-993c7a6d410c.png)
Simple arrow down
![screenshot 2014-09-16 14 27 30](https://cloud.githubusercontent.com/assets/1119565/4293550/251e1b24-3dd7-11e4-829d-81111dce86c7.png)