Add to doc info regarding `fb-flo-reload` event, implements #53

Added information regarding the `fb-flo-reload` event, that is fired upon any resource updating, to the README.md file. (implementing #53)
Included short example of how the `fb-flo-reload` event can be used
Merge pull request #54 from MihaiValentin/patch-1

Add to doc info regarding `fb-flo-reload` event, implements #53
Proposal: Executing client-side code as part of the callback