Add propertyIs filter

The existing property match filter tests a property
in the PropertiesChanged signal payload.

Add a match filter that tests any arbitrary property on
any object.

Change-Id: I1c238c03a3ccbf45f7b338693a4342fbd4f670c2
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/Makefile.am b/Makefile.am
index 36edbca..16d35b9 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -14,6 +14,7 @@
 libmanager_la_SOURCES = \
 	xyz.openbmc_project.Inventory.Manager.cpp \
 	generated.cpp \
+	events.cpp \
 	manager.cpp
 libmanager_la_LIBADD = libextra.la