Installing MapKnitter exporter dependencies

[jywarren]

I'm trying to install all deps for MapKnitter Exporter only, so I can start isolating out the code in the exporter, as per #298 -- but getting some errors (on ARM, admittedly so maybe not on a normal x86 system)

Trying just gdal and python-gdal now, then imagemagick separately

sudo apt-get install gdal-bin python-gdal

sudo apt-get install imagemagick ruby-rmagick libfreeimage3 libfreeimage-dev ruby-dev libmagickcore-dev libmagickwand-dev

These return the following error: https://gist.github.com/jywarren/7872bda6ee3ae460fb806dcc52c5316e

working on this...

[jywarren]

Could be we need to include more sources: https://askubuntu.com/questions/417466/arm-ubuntu-fails-to-get-certain-packages

[jywarren]

also trying sudo apt-get update then re-running

[jywarren]

This seems to be working...

[jywarren]

That worked!!!
#331