Add an autoreload option to have instant feedback

[schmitch]

Provide a way to reload finatra, so that people have some instant feedback.

It would be great if there is built in support for auto reloading of code something like that:

http://www.scala-sbt.org/release/docs/Triggered-Execution.html

[cocodrino]

+1

[scosenza]

sbt-revolver has a ~re-start command which looks promising. If someone can test it out and add it to one of our example apps, we'll happily accept the PR. Thanks!

[Bugagazavr]

so sbt-revolver working for me, but with some downtime

in plugins.sbt

addSbtPlugin("io.spray" % "sbt-revolver" % "0.7.2")

in build.sbt/Build.scala

Revolver.settings

and then sbt ~re-start

[cacoco]

Addressed in baabcf3