Updated search ordering when looking for holoviews.rc (#1700)

* Updated search ordering when looking for holoviews.rc

* Updated rc file documentation.

Author: jlstevens

examples/user_guide/Installing_and_Configuring.ipynb

@@ -134,7 +134,13 @@
    "source": [
     "## The holoviews.rc file\n",
     "\n",
-    "HoloViews searches the following places (in order) for an rc file: ``~/.holoviews.rc``, ``~/.config/holoviews/holoviews.rc``, and then the parent directory of the top-level ``__init__.py`` file (useful for developers working out of the HoloViews git repo). The rc file location can be overridden via the ``HOLOVIEWSRC`` environment variable.\n",
+    "HoloViews searches for the first rc file it finds in the following places (in order): \n",
+    "\n",
+    "1. ``holoviews.rc`` in the parent directory of the top-level ``__init__.py`` file (useful for developers working out of the HoloViews git repo)\n",
+    "2. ``~/.holoviews.rc``\n",
+    "3. ``~/.config/holoviews/holoviews.rc``\n",
+    "\n",
+    "The rc file location can be overridden via the ``HOLOVIEWSRC`` environment variable.\n",
     "\n",
     "The rc file is a Python script, executed as HoloViews is imported. An example rc file to include various options discussed above might look like this:\n",
     "\n",

holoviews/__init__.py

@@ -49,10 +49,10 @@ def __call__(self, *args, **opts): # noqa (dummy signature)
 
 # A single holoviews.rc file may be executed if found.
 for rcfile in [os.environ.get("HOLOVIEWSRC", ''),
-               "~/.holoviews.rc",
-               "~/.config/holoviews/holoviews.rc",
                os.path.abspath(os.path.join(os.path.split(__file__)[0],
-                                            '..', 'holoviews.rc'))]:
+                                            '..', 'holoviews.rc')),
+               "~/.holoviews.rc",
+               "~/.config/holoviews/holoviews.rc"]:
     filename = os.path.expanduser(rcfile)
     if os.path.isfile(filename):
         with open(filename) as f: