working radiusSearch implementation #176
Merge pull request #184 from PDAL/issues/184-required-numpy

CMake doesn't die when USE_PYTHON=ON and NumPy is not found
Merge branch 'master' into issues/176-PointBuffer-index

Conflicts:
	src/PointBuffer.cpp
	test/unit/PointBufferTest.cpp
ifdef guard FLANN, add destructor to PointBuffer
clean up destructor
turn off flann test for now because travis isn't up to date yet
ifdef guard FLANN stuff for #185
Merge branch 'master' into issues/176-PointBuffer-index

Conflicts:
	src/PointBuffer.cpp
	test/unit/PointBufferTest.cpp
turn off indexing test for now
turn off debug noise in soci test