* add filter field into OverlayOptions message
* chooseFiltered method, add excluded parameter in populate method
* change excluded type to []dht.NodeID in ChooseFiltered, change comment
* change name filter to excluded_nodes in proto
* implement helper function contains
* delete ChooseFiltered and add its functionality into Choose method to keep original author's history, add excluded argument into Choose calls
* regenerate mock_client.go
* regenerate protobuf
* adding the repair() func
* update test case to use new IDFromString function
* modified the repair() and updated streams mock
* modified the repair() and updated streams mock
* Options struct
* adding the repair() func
* modified the repair() and updated streams mock
* modified the repair() and updated streams mock
* integrating the segment repair()
* development repair with hack working
* repair segment changes
* integrated with mini hacks and rigged up test case with dev debug info
* integrated with ec and overlay
* added repair test case
* made the getNewUniqueNodes() to recursively go thru choose() to find get the required number of unique nodes
* cleaned up code
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