Functions that are placed in a graph do not update when pins are added/subtracted

If the user creates a function and then places it into the event graph and then goes back and add and output pin the function that is already in the graph will not update and will need to be replaced. This could lead to work flow issues if the function is used a lot in a single graph.

1. Open the first person example in the Editor
2. Open the Character blueprint
3. Create a new Function via the [+] button in the My Blueprints panel
4. Compile and save the function
5. Add the new function to the event graph
6. Open up the function again
7. Add an output pin by clicking the [New] button in the details panel
8. Compile and Save the function
9. Go back to the event graph
10. Notice that the function does not have the new output pin that was created