Wait() for forked processes

gin does not call Wait() on the started processes, effectively creating
zombies everytime it builds or restarts the app. This rectifies that.
Removed the Wait() in runner.go

We don't need to wait in runner.go since Runner makes sure that the
server process is killed before spawning a new one. The issue with
zombie processed had to do with the go build command not being waited
upon
Simplified the builder command
Merge pull request #22 from codegangsta/Merovius-wait

Fixing Zombie processes from builder.go