Add gdal to compute requirements
Changed instructions to say start the combined VM, rather than all the machines.
Add info about the location of the combined VM (ip address)
Change URLs to point to combined VM
don't use grains to separate configurations. (makes it possible to deploy same config to machines with different names)
add instructions to get started with local master and minion
plone already needs gcc, c++ and make to build lxml
add gdal binary to plone requirements
make groups property in users template optional
Adds instructions on updating the VM.
Add postgis to base ELGIS packages.
typo
update salt states for simplified visualised buildout
Change visualiser back to using Github as source for visualiser repo (rather than a local directory)
merge master into branch
merge simplify_buildout into add_data_mover_to_combined (this branch)