Merge branch 'master' of https://code.google.com/p/weed-fs/
Conflicts: weed-fs/src/pkg/topology/node.go weed-fs/src/pkg/topology/server.go weed-fs/src/pkg/topology/topo_test.go weed-fs/src/pkg/topology/topology.go
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Conflicts: weed-fs/src/pkg/topology/node.go weed-fs/src/pkg/topology/server.go weed-fs/src/pkg/topology/topo_test.go weed-fs/src/pkg/topology/topology.go