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
implement an enabled static flag for Stage:: #325
Merge pull request #325 from PDAL/issues/325-stage-enabled-status

pdal info --drivers should tell you whether or not a driver is enabled
Add default statement to fix busted GCC implementation.
clean up some cast warnings that gcc 4.8 found
ignore ./lib directory
don't link to ourselves for libpdalcpp.so
update my config
use RPATH on OSX by default now
Merge pull request #327 from PDAL/issues/326-missing-case

Add default statement to fix busted GCC implementation.
Add a sbet writer

This writer can create sbet files, which store IMU data. Since the sbet
format is pretty dumb (just a struct), this writer is pretty dumb as
well.
Update doxygen.conf

This update was done by running `doxygen -u doc/doxygen/doxygen.conf`.
Without this patch, doxygen 1.8.4 produces warnings when run with our
configuration file.  For example:

> Warning: Tag `SYMBOL_CACHE_SIZE' at line 323 of file doc/doxygen/doxygen.conf has become obsolete.

This patch removes those warnings.
Remove m_pointCountType and references

Per discussion in #328, pointCountType is not and will mostly likely not
be used. This patch removes the member variable from Stage and all
references to that variable and its associated methods.

Closes #329.
add --detail to 'pdal delta' doc