sys/net/ccn_lite/README.md change wording + add ACM ICN reference

sys/net/ccn_lite/README.md fix encoding
net: Initial import of a global packet buffer
Merge pull request #1716 from waehlisch/master

Update CCN-lite Readme
Merge pull request #1638 from authmillenon/packetbuf2

net: Initial import of a global packet buffer