Try fix RTD build

Signed-off-by: Adam Dybbroe <Adam.Dybbroe@smhi.se>

doc/conf.py

@@ -20,6 +20,18 @@
 sys.path.insert(0, os.path.abspath('../'))
 sys.path.insert(0, os.path.abspath('../pyspectral'))
 
+# this is quite dirty approach but we're not working at NASA and nobody can die
+# because of that. Am I right?
+on_rtd = os.environ.get('READTHEDOCS', None) == 'True'
+if on_rtd:
+    render_examples = False
+    # hack for lacking git-lfs support on rtd
+    from git_lfs import fetch
+    fetch(os.path.dirname(os.path.dirname(os.path.dirname(__file__))))
+
+else:
+    render_examples = True
+
 
 class Mock(object):
 

setup.py

@@ -37,7 +37,7 @@
 requires = ['docutils>=0.3', 'numpy>=1.5.1', 'scipy>=0.14',
             'python-geotiepoints>=1.1.1',
             'h5py>=2.5', 'requests', 'six', 'pyyaml',
-            'appdirs']
+            'appdirs', 'git-lfs']
 
 dask_extra = ['dask[array]']
 test_requires = ['pyyaml', 'dask[array]', 'xlrd']  # , 'matplotlib']