name: allow negative argument for 'get' method to get component from the back
name: allow negative argument for 'get' method to get component from the back

Change-Id: I7e76fc16dfc5ce8ed2a18cfb461f884b82e1b274

cawka/packaging-ndn-cpp-dev,cawka/packaging-ndn-cpp-dev,cawka/packaging-ndn-cpp-dev,cawka/packaging-ndn-cpp-dev