Added Boost.Signals library

[SVN r13964]

.gitmodules

@@ -134,6 +134,10 @@
 	path = libs/multi_array
 	url = ../multi_array.git
 	fetchRecurseSubmodules = on-demand
+[submodule "signals"]
+	path = libs/signals
+	url = ../signals.git
+	fetchRecurseSubmodules = on-demand
 [submodule "preprocessor"]
 	path = libs/preprocessor
 	url = ../preprocessor.git

Jamfile

@@ -2,3 +2,4 @@ project-root ;
 subinclude libs/regex/build ;
 subinclude libs/thread/build ;
 subinclude libs/python/build ;
+subinclude libs/signals/build ;

libs/detail

@@ -1 +1 @@
-Subproject commit d9d6a970cfd4d6003e95c889e315184bc93c6490
+Subproject commit 9663499093cc61e088b8a631a8d83ef9bbe83247

libs/signals

@@ -0,0 +1 @@
+Subproject commit bce8c0037f2254665bc3109989299f95ceff7484