fix #51 symbol to liquid conversion

features/bibtex.feature

@@ -94,7 +94,7 @@ Feature: BibTeX
     Given I have a scholar configuration with:
       | key                   | value                                         |
       | source                | ./_bibliography                               |
-      | bibliography_template | <abbr>{{index}} [{{key}}]</abbr>{{reference}} |
+      | bibliography_template | <abbr>{{index}} {{entry.type}} [{{key}}]</abbr>{{reference}} |
     And I have a "_bibliography" directory
     And I have a file "_bibliography/references.bib":
       """
@@ -115,7 +115,7 @@ Feature: BibTeX
     Then the _site directory should exist
     And the "_site/scholar.html" file should exist
     And I should see "<i>The Ruby Programming Language</i>" in "_site/scholar.html"
-    And I should see "<abbr>1 \[ruby\]</abbr><span" in "_site/scholar.html"
+    And I should see "<abbr>1 book \[ruby\]</abbr><span" in "_site/scholar.html"
 
   @tags @filter
   Scenario: Filtered Bibliography Loaded From Default Directory
@@ -151,7 +151,7 @@ Feature: BibTeX
     And I should not see "<i>The Ruby Programming Language</i>" in "_site/scholar.html"
     And I should see "<i>Smalltalk Best Practice Patterns</i>" in "_site/scholar.html"
 
-  @tags @filter @variables @wip
+  @tags @filter @variables
   Scenario: Filter using interpolated query variable
     Given I have a scholar configuration with:
       | key    | value             |

lib/jekyll/scholar/utilities.rb

@@ -239,7 +239,7 @@ module Jekyll
           'entry' => liquidify(entry),
           'reference' => reference_tag(entry, index),
           'key' => entry.key,
-          'type' => entry.type,
+          'type' => entry.type.to_s,
           'link' => repository_link_for(entry),
           'index' => index
         })
@@ -249,7 +249,7 @@ module Jekyll
         e = {}
 
         e['key'] = entry.key
-        e['type'] = entry.type
+        e['type'] = entry.type.to_s
 
         if entry.field?(:abstract)
           tmp = entry.dup