Add setting for posts per page

closes #593
- added default setting of 6 posts per page
- added posts per page to settings page
- added limit to frontend.js (setting does not change API behavior)

ghost/admin/tpl/settings/general.hbs

@@ -61,6 +61,11 @@
                     {{/each}}
                 </select>
             </div>
+            <div class="form-group">
+                <label for="postsPerPage"><strong>Posts per page</strong></label>
+                <input id="postsPerPage" name="general[postsPerPage]" type="number" value="{{postsPerPage}}">
+                <p>Number of posts per page displayed</p>
+            </div>
 
         </fieldset>
 

ghost/admin/views/settings.js

@@ -164,7 +164,8 @@
                 email: this.$('#email-address').val(),
                 logo: this.$('#logo').attr("src"),
                 icon: this.$('#icon').attr("src"),
-                activeTheme: this.$('#activeTheme').val()
+                activeTheme: this.$('#activeTheme').val(),
+                postsPerPage: this.$('#postsPerPage').val()
             }, {
                 success: this.saveSuccess,
                 error: this.saveError