Add a Signals API for Binding to Events

[rdegges]

It would be awesome if this library supported binding to signals for events, stuff like:

• user created
• user logged in
• user updated
• user deleted
• etc

[bq1990]

I can't seem to get the user_created signal to work in version 0.4.4. Am I doing something wrong? https://gist.github.com/bq1990/ba145bb6c6115c715c18

[rdegges]

Hey @bq1990, here's a working example for ya: https://gist.github.com/rdegges/8de4ec51e2e370246b38