Implemented the remove_edge_if, remove_out_edge_if, and remove_in_edge_if

functions, and added some examples that use these functions. Also
added documentation for them.


[SVN r7864]

libs/graph

@@ -1 +1 @@
-Subproject commit 779f0d6f88f4c5b31e565baae27e951c125f8a3b
+Subproject commit 835b646ee7cc2c59212486814f8b62626f071444