Fix documentation links in snippets

src/jupyter_contrib_nbextensions/nbextensions/snippets_menu/main.js

@@ -200,6 +200,7 @@ define([
             a.attr({
                 'target' : '_blank',
                 'title' : 'Opens in a new window',
+                'href' : menu_item_spec['external-link'],
             });
             $('<i class="fa fa-external-link menu-icon pull-right"/>').appendTo(a);
             $('<span/>').html(menu_item_spec.name).appendTo(a);

src/jupyter_contrib_nbextensions/nbextensions/snippets_menu/readme.md

@@ -56,6 +56,22 @@ remind you to put informative labels in your plots.  If you don't
 want, e.g., a title on your plot, just remove that line.
 
 
+Installation
+------------
+To install this extension alone (without the [main collection of nbextensions](https://github.com/ipython-contrib/jupyter_contrib_nbextensions)), run the following from the command line:
+
+```bash
+git clone git://github.com/moble/jupyter_boilerplate
+jupyter nbextension install jupyter_boilerplate
+jupyter nbextension enable jupyter_boilerplate/main
+```
+
+You can then disable the extension if you want with
+```bash
+jupyter nbextension disable jupyter_boilerplate/main
+```
+
+
 Basic menu customization
 ------------------------
 

src/jupyter_contrib_nbextensions/nbextensions/snippets_menu/snippets_submenus_python/python.js

@@ -26,6 +26,10 @@ define([
                         'name' : 'Conditional list comprehension',
                         'snippet' : ['[x**2 for x in range(-10, 11) if (x%3)==0]',],
                     },
+                    {
+                        'name' : 'Conditional alternative list comprehension',
+                        'snippet' : ['[x**2 if (x%3)==0 else x**3 for x in range(-10, 11)]',],
+                    },
                     {
                         'name' : 'Reversed list',
                         'snippet' : ['reversed(l)'],