Don't use naiveSkipImpl.
Merge pull request #322 from PDAL/issues/317-naive-skip

Don't use naiveSkipImpl.
Add CONTRIBUTING.md

A CONTRIBUTING file can be useful for guiding new developers when they
are submitting changes, and Github supports
(https://github.com/blog/1184-contributing-guidelines) integration of
these CONTRIBUTING files into the pull request user interface.

This patch adds a basic CONTRIBUTING file.
Merge pull request #323 from gadomski/contributing

Add CONTRIBUTING.md
step back to allowing boost 1.52, force a re-find_package of boost when PCL is enabled (its CMake mucks up the components
point to PCL
put bakc c++0x flag for gcc
Merge branch 'master' into rxp-driver