Fix external links in navigation bar

Author: silvolu

docs/_templates/layout.html

@@ -113,25 +113,25 @@ <h1 class="page-title">Python</h1>
         {{ toctree(includehidden=True, maxdepth=1, titles_only=True) }}
         <ul class="external-links">
           <li>
-            <a href="" title="Python on Github">
+            <a href="https://github.com/GoogleCloudPlatform/gcloud-python/" title="Python on Github">
               <img src="_static/images/icon-link-github.svg" alt="Github icon" />
               Github
             </a>
           </li>
           <li>
-            <a href="" title="Python issues on Github">
+            <a href="https://github.com/GoogleCloudPlatform/gcloud-python/issues" title="Python issues on Github">
               <img src="_static/images/icon-link-github.svg" alt="Github icon" />
               Issues
             </a>
           </li>
           <li>
-            <a href="" title="gcloud on StackOverflow">
+            <a href="http://stackoverflow.com/questions/tagged/gcloud-python" title="gcloud on StackOverflow">
               <img src="_static/images/icon-link-stackoverflow.svg" alt="StackOverflow icon" />
               gcloud
             </a>
           </li>
           <li>
-            <a href="" title="Python package manager">
+            <a href="https://pypi.python.org/pypi/gcloud" title="Python package manager">
               <img src="_static/images/icon-link-package-manager.svg" alt="Package Manager icon" />
               Package Manager
             </a>