Edit Makefile to include examples.

ndnSIM 2.1 extensions on top of ns-3.23-dev. Extensions include:

- 2c66f4c core: Additional code for ability to generate subset of documentation by utils/print-introspected-doxygen
- 4da74c6 build: Fix waf-tools/boost.py
- cb9702a build: Removing 'subst' feature that is defined in waf (waflib/TaskGen.py)
- d2e78cc bindings: Automatically try to generate pybindgen version if it is not available
- 1cdf542 build: Add compiler flag checking
- a22fb1b core: Give ability to generate subset of documentation by utils/print-introspected-doxygen
- 5e112ce bindings: Version update and ndnSIM-related updates
- 55025b4 build: Extend .pc file generation to include `export_includes` option
- 8200d73 build: Build script improvements
- 7ce4e68 build: Force to compile using C++11
- f401403 build: Disable -Werror flags
- 4b404bb topology-read: Rescan bindings
- 0ac1381 topology-read: Making default constructor for TopologyReader::Link public.
- dd25de7 topology-read: TopologyReader and derivatives are no longer Objects
- 2d976ae topology-read: Several extensions of TopologyReader
- cb4770b bindings+network: Packet API extension, allowing creating of packet from string (for python bindings)
- 8ab3d4e bindings+network: Adding STL-like iterator wrappers (begin(), end(), size()) for NodeContainer class
- e1fd51e visualizer+ndnSIM: Adding ability to visualize items of the content store in real time
- 86e477e visualizer+ndnSIM: Adding plugin to display ndnSIM PIT status
- a0c8acf visualizer+ndnSIM: Adding plugin to display a ndnSIM FIB state
- 15c018f visualizer: Modifying the way visualizer is installed
- 4193a68 visualizer: Adding ability to assign position to mobility model is env{NS_VIS_ASSIGN} is set to any value
- f0773a1 visualizer: output node ID
- 0c20bbf visualizer: Making a periodic topology rescan
- 117d21b visualizer+mobility+bindings: A specialized version of GetObject (GetMobilityModel) in MobilityModel
- ef9e955 fd-net-device: Add missing include for strerror
- 174704a point-to-point: Extending helper interface to support setting individual queue parameters
- efabb7d point-to-point-layout: Respect absolute values of specified boundaries
- dec5219 point-to-point: Add support of NDN protocol
- 718d156 Adding .gitignore and disclaimer note in README

Revision 2 of ndnSIM 2.0 extension, based on ns-3.21

update RELEASE_NOTES for release

small edits on previous commit

The following updates applied to ns-3.21:

- (fc42a8a) core: Add compiler flag checking
- (70cc04f) core: Extend utils/print-introspected-doxygen to print available
  LogComponents
- (32bfe45) core: Give ability to generate subset of documentation by
  utils/print-introspected-doxygen
- (1ee20a8) bindings: Version update and ndnSIM-related updates
- (8da46fa) build: Avoid deprecated method in src/wscript
- (dcd0692) build: Force to compile using C++11
- (861e001) python: Fix bug with version detection
- (bda0c62) bindings: Fixes
- (620e5dc) topology-read: Making default constructor for TopologyReader::Link
  public.
- (f438ab1) topology-read: TopologyReader and derivatives are no longer Objects
- (bf89dfd) topology-read: Several extensions of TopologyReader
- (965856d) build: Disable -Werror flags
- (dba04b9) build: Update to waf with an upgraded version of python tool
- (6995e94) build: no longer require fake `ns3' directory in NS-3's root folder
- (a45b54b) bindings+network: Packet API extension, allowing creating of packet
  from string (for python bindings)
- (6deb565) bindings+network: Adding STL-like iterator wrappers (begin(), end(),
  size()) for NodeContainer class
- (8e06500) visualizer: Modifying the way visualizer is installed
- (e50a026) visualizer+ndnSIM: Adding ability to visualize items of the content
  store in real time
- (5c75520) visualizer: Adding ability to assign position to mobility model is
  env{NS_VIS_ASSIGN} is set to any value
- (24cb6b5) visualizer: output node ID
- (92c9ec3) visualizer: Update visualizer plugins to reflect refactored ndnSIM
  code
- (75df5e1) visualizer+ndnSIM: Adding plugin to display ndnSIM PIT status
- (ddde1f0) visualizer: Making a periodic topology rescan
- (18aba9a) visualizer+ndnSIM: Adding plugin to display a ndnSIM FIB state
- (77adeaf) visualizer+mobility: A specialized version of GetObject
- ((GetMob)ilityModel) is now implemented in MobilityModel class. This method is
  now
- (used by) the visualizer to obtain mobility interface.
- (c958f20) fd-net-device: Add missing include for strerror
- (244f624) point-to-point: Extending helper interface to support setting
  individual queue parameters
- (2dc940f) point-to-point-layout: Respect absolute values of specified
  boundaries
- (eb7dde0) point-to-point, netanim: Adding ChannelID to PointToPointChannel
  trace
- (6538029) point-to-point: Add support of NDN protocol
- (baa8ccf) Adding .gitignore and disclaimer note in README

rescan remaining bindings

bindings: Fixes

Latest version on top of NS-3.18 branch

update fd-tap-ping.cc instructions