Small ui improvements to snippet page

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/views/snippets/show.html.haml

 - page_title @snippet.title, "Snippets"
-%h3.page-title
+%h4.page-title
   = @snippet.title
   - if @snippet.private?
@@ -8,17 +8,14 @@
       private
   .pull-right
-    = link_to new_snippet_path, class: "btn btn-new", title: "New Snippet" do
+    = link_to new_snippet_path, class: "btn btn-new btn-sm", title: "New Snippet" do
       Add new snippet
-%hr
-.append-bottom-20
+.append-bottom-10.prepend-top-10
   .pull-right
-    = "##{@snippet.id}"
     %span.light
-      by
+      created by
       = link_to user_snippets_path(@snippet.author) do
-        = image_tag avatar_icon(@snippet.author_email), class: "avatar avatar-inline s16", alt: ''
         = @snippet.author_name
   .back-link
@@ -27,7 +24,7 @@
         ← your snippets
     - else
       = link_to snippets_path do
-        ← discover snippets
+        ← explore snippets
 .file-holder
   .file-title