New ?_shape=objects/object/lists param for JSON API (#192)

New _shape= parameter replacing old .jsono extension

Now instead of this:

	/database/table.jsono

We use the _shape parameter like this:

	/database/table.json?_shape=objects

Also introduced a new _shape called 'object' which looks like this:

	/database/table.json?_shape=object

Returning an object for the rows key:

	...
	"rows": {
		"pk1": {
			...
		},
		"pk2": {
			...
		}
	}

Refs #122

datasette/templates/query.html

@@ -40,7 +40,7 @@
 </form>
 
 {% if rows %}
-<p>This data as <a href="{{ url_json }}">.json</a>, <a href="{{ url_jsono }}">.jsono</a></p>
+<p>This data as <a href="{{ url_json }}">.json</a></p>
 <table>
     <thead>
         <tr>

datasette/templates/row.html

@@ -22,7 +22,7 @@
 
 {% block description_source_license %}{% include "_description_source_license.html" %}{% endblock %}
 
-<p>This data as <a href="{{ url_json }}">.json</a>, <a href="{{ url_jsono }}">.jsono</a></p>
+<p>This data as <a href="{{ url_json }}">.json</a></p>
 
 {% include custom_rows_and_columns_templates %}
 

datasette/templates/table.html

@@ -74,7 +74,7 @@
     <p><a class="not-underlined" title="{{ query.sql }}" href="/{{ database }}-{{ database_hash }}?{{ {'sql': query.sql}|urlencode|safe }}{% if query.params %}&amp;{{ query.params|urlencode|safe }}{% endif %}">&#x270e; <span class="underlined">View and edit SQL</span></a></p>
 {% endif %}
 
-<p>This data as <a href="{{ url_json }}">.json</a>, <a href="{{ url_jsono }}">.jsono</a></p>
+<p>This data as <a href="{{ url_json }}">.json</a></p>
 
 {% include custom_rows_and_columns_templates %}