Add tag mgmt support to Casper

package.json

@@ -1,4 +1,4 @@
 {
   "name": "Casper",
-  "version": "1.1.3"
+  "version": "1.1.4"
 }

tag.hbs

@@ -1,8 +1,8 @@
 {{!< default}}
 {{! The tag above means - insert everything in this file into the {body} of the default.hbs template }}
 
-{{! The big featured header }}
-<header class="main-header tag-head {{#if @blog.cover}}" style="background-image: url({{@blog.cover}}){{else}}no-cover{{/if}}">
+{{! If we have a tag cover, display that - else blog cover - else nothing }}
+<header class="main-header tag-head {{#if tag.image}}" style="background-image: url({{tag.image}}){{else}}{{#if @blog.cover}}" style="background-image: url({{@blog.cover}}){{else}}no-cover{{/if}}{{/if}}">
     <nav class="main-nav overlay clearfix">
         <a class="back-button icon-arrow-left" href="{{@blog.url}}">Home</a>
         <a class="subscribe-button icon-feed" href="{{@blog.url}}/tag/{{tag.slug}}/rss/">{{tag.name}}</a>
@@ -10,7 +10,12 @@
     <div class="vertical">
         <div class="main-header-content inner">
             <h1 class="page-title">{{tag.name}}</h1>
-            <h2 class="page-description">A {{pagination.total}}-post collection</h2>
+            <h2 class="page-description">
+                {{#if tag.description}}
+                    {{tag.description}}
+                {{else}}
+                    A {{pagination.total}}-post collection</h2>
+                {{/if}}
         </div>
     </div>
 </header>