Added GeoDjango npm requirements in dockerfile, readme

Dockerfile

@@ -17,9 +17,9 @@ ADD . /webodm/
 RUN git submodule init 
 RUN git submodule update
 
-# Install Node.js + npm requirements for testing node-OpenDroneMap and React
+# Install Node.js + other packages
 RUN curl --silent --location https://deb.nodesource.com/setup_7.x | bash -
-RUN apt-get install -y nodejs
+RUN apt-get install -y nodejs binutils libproj-dev gdal-bin
 
 WORKDIR /webodm/nodeodm/external/node-OpenDroneMap
 RUN npm install

README.md

@@ -38,6 +38,14 @@ If you want to run WebODM natively, you will need to install:
  * PostGIS 2.3
  * Python 3.5
 
+On Linux, make sure you have:
+
+```
+apt-get install binutils libproj-dev gdal-bin
+```
+
+On Windows use the [OSGeo4W](https://trac.osgeo.org/osgeo4w/) installer to install GDAL.
+
 Then these steps should be sufficient to get you up and running:
 
 ```