CPPF Implementation
Formatting.
Added CPPFSignature struct. Modified CMakeLists.txt
added equal3() method to auxiliary.h and added a check to getFullLeavesIntersectedBySphere to prevent inclusion of source point leaf
reformatted according to PCL coding style
added unit test case for the ORROctree function getFullLeavesIntersectedBySphere()
changed the main error messages
more formatting changes to adhere to pcl coding style
fixed spacing issues
Add: method getKeypointsIndices to get keypoints indices in input

Provide a method to return found keypoints indices in the input. Not
all detectors would populate the keypoints_indices_ so you need to
check for emptiness befor use in set****Indices methods.
Add: example for getKeypointsIndices method
Fixed bug in passthrough filter

- Points on filter boundaries were included into inliers (i.e.
  'setFilterLimitsNegative (false)') and outliers (i.e.
  'setFilterLimitsNegative (true)'). Now points on the boundaries belong
  only to the set of inliers.
Merge pull request #331 from SvenAlbrecht/bugfix_passthrough

Fixed bug in passthrough filter
Merge pull request #318 from nizar-sallem/kp_indices

keypoints indices feature
Merge pull request #269 from musi00/ObjRecRANSAC_addModel_error

ObjRecRANSAC::addModel() error
Merge pull request #296 from mszarski/cppf-impl

CPPF Feature Implementation per issue #280