Adds helper to run an app via sbt.
Let's try php+ mode.

Adds helm-gtags dependency.
Adds a binding for helm-imenu.
Fixes typo in comment.
Don't enable flymake in java buffers, need to be smarter about the classpath.
Don't load ensime-cursor.
I don't ever want a gui prompt.
Enables ENSIME ac-source, but delay the triggering.