add pgpointcloud to vagrant buildout
fix Vagrantfile typo
add pgpointcloud to Vagrant config
add doc about Vagrant
fix up pgpointcloud build, add read xml example
vagrant doc tweaks
output first read point
Merge branch 'master' of github.com:PDAL/PDAL
more doc updates
Merge branch 'master' of github.com:PDAL/PDAL