Interaction tab help

This commit clarifies the tooltip tab and pulls variables for each vector source and inserts this into the code

### Help
![info](https://f.cloud.github.com/assets/61150/2449654/03dfc254-aeb3-11e3-84c3-f6ce6ab206e7.gif)

### Populate
![populate](https://f.cloud.github.com/assets/61150/2449661/13c9881c-aeb3-11e3-962d-681cc4c64738.gif)