issue #264, converted ask and wait block to expression from step

I'm not exactly sure what is meant by "block is broken", but I'm thinking that this block would be much more useful as an expression ala:

![screen shot 2013-09-24 at 9 26 56 pm](https://f.cloud.github.com/assets/5093064/1205955/174b9b70-2596-11e3-914e-587ac8133501.png)