build: Disable Ethernet face support on OSX with Boost 1.56

Change-Id: Ib3415d5fa1d64e76877bb0f1dcfda783cfe47ca7
Refs: #1877
docs: Updated release notes

Change-Id: I4c56a4ed41fc186b44e6ad284c7a9c18a82889ba
doc: streamline NFD homepage and README documentation

refs: #1905

Change-Id: I7e03c05467cadd440efc0e0b1deb3abac930fd78