NFD

After reading NFD Developer Guide, I realize that the correct place to implement this feature is in ContentStore.

\item If one or more matching PIT entries are found, the Data is inserted to ContentStore.
Note that even if the pipeline inserts the Data to the ContentStore, whether it is stored and how long it stays in the ContentStore is determined by ContentStore admission and replacement policy.%
\footnote{The current implementation has fixed ``admit all'' admission policy and ``priority FIFO'' as replacement policy, see Section~\ref{sec:tab-cs}.}

http://gerrit.named-data.net/1782

I will update NFD Developer Guide after Change is merged.

I notice that #2254 and #1706 did not update NFD Developer Guide.
I'll update for these as part of this issue.
This requires an increasing of "Estimated time".

NFD Developer Guide is updated.

I'm closing this issue because there's no objection in past 7 days.