make addDriver method public
--drivers is only available in long form
increment sha
remove generated gitsha.cpp
try to remove gitsha.cpp
add src/gitsha.cpp
First new pipeline docs
Cross referencing
stage name as header?
Update the chipper entry
Chipper default size is 5000, not 0 (zero?)
Merge branch 'master' into pipelinedocs
Add in place reprojection filter
document pg reader
Add decimation filter
Add cropping
Las format pages
Add notes about building the documentation

Add a simple section to doc/development/docs.txt about building the
documentation from source. Include instructions on installing python
packages, finding and installing doxygen, and building html docs (as an
example).

Close #141
Bind reference into docs toc
Merge branch 'master' of github.com:PDAL/PDAL