This is the release of CCN-lite V2.

• Restructuration of the Code to a library system
  Code was split to following libraries:
  • ccnl-core: basic data structures
    • ccnl-fwd: forwarding functionality of CCN-lite
    • ccnl-nfn: library for NFN support
    • ccnl-pkt: packet encoding library, can be used for end point application with no forwarding requirements
    • ccnl-riot: RIOT integration library
• change build system to cmake
• add further RIOT support
  - add compressed packet format in an early stage
• Fix a lot of Bugs
• Fix some CVEs (discovered by Eric Sesterhenn / X41 D-Sec):
  CVE-2017-12412, CVE-2017-12464, CVE-2017-12465, CVE-2017-12466, CVE-2017-12467, CVE-2017-12468, CVE-2017-12469, CVE-2017-12471, CVE-2017-12472