Merge pull request #1235 from astrofrog/dev-install-docs

Add instructions for installing the latest developer version

doc/installation.rst

@@ -217,3 +217,31 @@ arguments. See ``glue --help`` for examples.
           within the python script directory (e.g., ``C:\Python27\Scripts``).
           Windows users can create a desktop shortcut for this file, and run
           Glue by double clicking on the icon.
+
+Installing the latest developer version
+---------------------------------------
+
+If you are using conda, the easiest way to get all the dependencies installed
+when using the developer version is to first install the stable version, which
+will pull in all the dependencies, then to remove it and install the developer
+version::
+
+    conda install -c conda-forge glueviz glue-vispy-viewers
+    conda remove glueviz glue-vispy-viewers
+
+    git clone git://github.com/glue-viz/glue
+    cd glue
+    pip install .
+    cd ..
+
+    git clone git://github.com/glue-viz/glue-vispy-viewers
+    cd glue-vispy-viewers
+    pip install .
+    cd ..
+
+If you want to then uninstall the developer versions and install the stable
+versions again, you can uninstall the developer versions with::
+
+    pip uninstall glueviz glue-vispy-viewers
+
+then install the stable versions with conda.