Multiple Dex Support - part 2

- CS fixes
 - adds support for building multiple dex
 - prevents extra dex from being unknown and extra dex
 - adds unit-test

brut.apktool/apktool-lib/src/test/resources/brut/apktool/testapp/smali_classes2/HelloDualDexSupport.smali

@@ -0,0 +1,15 @@
+.class public LHelloDualDexSupport;
+
+.super Ljava/lang/Object;
+
+.method public static main([Ljava/lang/String;)V
+    .registers 2
+
+    sget-object v0, Ljava/lang/System;->out:Ljava/io/PrintStream;
+
+    const/high16 v1, 0x7f020000
+
+    invoke-virtual {v0, v1}, Ljava/io/PrintStream;->println(Ljava/lang/String;)V
+
+    return-void
+.end method