NDN -> Face

Change-Id: I2b5fbb88cc6ba13c97c0318f5a72855174a4c7f0
pyndn -> ndn

Change-Id: I9df85b6e788b5d318f35d5a3be44a0d137026977
Changing callback API for expressInterestSimple

Change-Id: Ib34c1f894fd9525974edba99a6eec4a88b9a9c50
Deprecating closure-based interest expression (making it "private")

Change-Id: I1a7adb67de66b4aff38a54b2f8a9e18aa5535f65
Breaking backwards compatibility and major clean up

Change-Id: Ifb8b23a93e33166bcd85bcd7cea215cc2e01d080
Another set of global renamings (ContentObject -> Data)

Now code more or less compiles and passes trivial communication
test case

Change-Id: If5c5cde221cc043ac0356d200f5c5305f79b6458
Fixing indentation

Change-Id: Ifd28726c0583ef7c334c31b3f2234a729d19ad45
ccn -> ndn; _ndn -> _pyndn

Change-Id: I915002d1db10a149777900e5666a44098ba6883f