Change 'InputEventListener' to 'SwitchEventListener'

The final example currently fails because InputEventListener doesn't exist. I think it should be SwitchEventListener.
8th line for bitmap

The custom bitmap needs 8 lines but only 7 are given in the examples. Add an extra blank line to the top.
Merge pull request #6 from jrmhaig/master

Change 'InputEventListener' to 'SwitchEventListener'