stats: Add the reporting framework

This commit provides the stats reporting framework that can manage
several types of measurement reporters. Initially support for
rate_ctr and the statsd protocol is included.

Sponsored-by: On-Waves ehf
diff --git a/src/Makefile.am b/src/Makefile.am
index 93fc383..7aa6a78 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -15,7 +15,7 @@
 			 gsmtap_util.c crc16.c panic.c backtrace.c \
 			 conv.c application.c rbtree.c strrb.c \
 			 loggingrb.c crc8gen.c crc16gen.c crc32gen.c crc64gen.c \
-			 macaddr.c stat_item.c
+			 macaddr.c stat_item.c stats.c
 
 BUILT_SOURCES = crc8gen.c crc16gen.c crc32gen.c crc64gen.c