Adding conditional compilation against boost or bundled "ndnboost"

Change-Id: Ic6a9718d6cad920ffa7a1b4d74851a338ac6f5da
Fixing config file include from common.h

The generated config file does not necessarily lands into the source
tree (e.g., if waf is used)

Change-Id: I83bfa3078db1a51204860f047f5a6a17c3f760fc