add support to build zones and PIDs from json

Add support to build zones and PIDs from a json configuration file.

Change-Id: If8608dcd3e084cebabb71fc39851044df4d5d7c2
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/Makefile.am b/Makefile.am
index 09a52d5..cce4f4c 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -73,6 +73,7 @@
 	pid/stepwisecontroller.cpp \
 	pid/builder.cpp \
 	pid/builderconfig.cpp \
+	pid/buildjson.cpp \
 	pid/zone.cpp \
 	pid/util.cpp \
 	pid/pidthread.cpp \