examples+utils: Adding example to evaluate memory footprint of ContentStore/Pit
utils: Removing linux support from mem-usage (needs more careful checking of available headers)

closes #23
utils: Fixing compilation warning
examples: Fixing error in ndn-simple-with-pcap

closes #24
model: Mark face YELLOW when PIT entry times out in ndn::fw::GreenYellowRed strategy
Merge remote-tracking branch 'upstream/master'