Add ccn_header.c for parsing/creating file headers
Add ccn_header.c for parsing/creating file headers

svartika/ccnx,cawka/ndnx,svartika/ccnx,ebollens/ccnmp,svartika/ccnx,cawka/ndnx,ebollens/ccnmp,cawka/ndnx,svartika/ccnx,cawka/ndnx,cawka/ndnx,svartika/ccnx,ebollens/ccnmp,svartika/ccnx,svartika/ccnx,ebollens/ccnmp