ndn-cxx: Bumping to 0.2.0-rc2

Change-Id: Ic64bbe3166fd97ef51d4135c174395e000fe68fa
nfd: Bumping to 0.2.0-rc2

Change-Id: I377696326ef174b01fce706bc0ba1d8f8f170d01
ndndump, ndnping, repo-ng: Bumping revision to force recompilation

Change-Id: I6aeae43f6df12f7488747d0707c0043b960d2b61