update bibtex dependency and add query test

features/bibtex.feature

@@ -89,3 +89,37 @@ 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"
+
+  @tags @filter
+	Scenario: Filtered Bibliography Loaded From Default Directory
+    Given I have a scholar configuration with:
+  	  | key    | value             |
+  	  | source | ./_bibliography   |
+		And I have a "_bibliography" directory
+	  And I have a file "_bibliography/references.bib":
+			"""
+			@book{ruby,
+			  title     = {The Ruby Programming Language},
+			  author    = {Flanagan, David and Matsumoto, Yukihiro},
+			  year      = {2008},
+			  publisher = {O'Reilly Media}
+			},
+			@book{smalltalk,
+			  title     = {Smalltalk Best Practice Patterns},
+			  author    = {Kent Beck},
+			  year      = {1996},
+			  publisher = {Prentice Hall}
+			}
+
+			"""
+	  And I have a page "scholar.html":
+			"""
+			---
+			---
+			{% bibliography references filter: @book[year <= 2000] %}
+			"""
+	  When I run jekyll
+	  Then the _site directory should exist
+		And the "_site/scholar.html" file should exist
+	  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"

jekyll-scholar.gemspec

@@ -26,7 +26,7 @@ Gem::Specification.new do |s|
 
   s.add_runtime_dependency('jekyll', '~> 0.10')
   s.add_runtime_dependency('citeproc-ruby', '~> 0.0.6')
-  s.add_runtime_dependency('bibtex-ruby', '~> 2.0.7')
+  s.add_runtime_dependency('bibtex-ruby', '~> 2.2')
 
   s.add_development_dependency('rake', "~> 0.9")
   s.add_development_dependency('rdoc', "~> 3.11")