Added mock for GDAL

Author: Kyran-Cook

docs/conf.py

@@ -61,4 +61,6 @@
 em_dash_char = chr(8212)
 html_title = "GeodePy: Geodesy in Python " + em_dash_char+  " v" + release + " Documentation"
 ogp_site_name = "GeodePy: Geodesy in Python"
-html_extra_path = ["_static/robots.txt", "_static/sitemap.xml"]
+html_extra_path = ["_static/robots.txt", "_static/sitemap.xml"]
+
+autodoc_mock_imports = ["osgeo","gdal","GDAL"]