Fix missing packages and references

Dockerfile

@@ -1,4 +1,4 @@
 FROM golang:1.9
 WORKDIR /go/src/fluux.io/xmpp
 COPY . ./
-RUN go get
+RUN go get github.com/processone/mpg123 github.com/processone/soundcloud

iq.go

@@ -4,7 +4,7 @@ import (
 	"encoding/xml"
 	"fmt"
 
-	"github.com/processone/gox/xmpp/iot"
+	"fluux.io/xmpp/iot"
 )
 
 // info/query

pep/user_tune.go

@@ -3,7 +3,7 @@ package pep // import "fluux.io/xmpp/pep"
 import (
 	"encoding/xml"
 
-	"github.com/processone/gox/xmpp"
+	"fluux.io/xmpp"
 )
 
 type iq struct {