add requirements for documentation and mocking for read the docs

doc_requirements.txt

@@ -0,0 +1,3 @@
+mock
+numpydoc
+sphinx_rtd_theme

docs/conf.py

@@ -13,6 +13,15 @@
 import inspect
 from sphinx import apidoc
 
+import mock
+
+MOCK_MODULES = ['numpy', 'pykdtree', 'netCDF4', 'scipy', 'pandas',
+                'statsmodels', 'matplotlib', 'pygeogrids', 'pygrib',
+                'pyresample', 'pybufr-ecmwf']
+
+for mod_name in MOCK_MODULES:
+    sys.modules[mod_name] = mock.Mock()
+
 __location__ = os.path.join(os.getcwd(), os.path.dirname(
     inspect.getfile(inspect.currentframe())))
 
@@ -52,7 +61,7 @@
 
 # General information about the project.
 project = u'pytesmo'
-copyright = u'2014, Christoph Paulik'
+copyright = u'2014-2015, TU Wien'
 
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the