easy-install.sh doesn't quite work out of the box

[chambbj]

@matthewhanson You don't currently host your easy-install.sh as part of this repo, but I thought I'd provide some feedback attempting to run it on a clean trusty64 box on vagrant. I noticed that your easy-install didn't quite work for me. Here are a few notes that I compiled while working through it all.

1. I had to install setuptools on my own (required by gippy and lidar2dems).
2. Many of your downloaded source code ends up being nested (e.g., points2grid is located within LASzip). I guess this isn't necessarily a problem, but I don't think it's what you intended. It took me a minute to figure out where all the downloaded code had gone.
3. I had to install swig on my own via apt-get (required by at least gippy).
4. Had trouble finding cpl_port.h while installing lidar2dems. Installing python-gdal via apt-get fixed this.
5. Needed to install libxslt1-dev via apt-get.

[matthewhanson]

Thanks a lot brad. This is a great help. I thought I had worked out all the dependencies, but will update the script this weekend, Thanks again,