updated gemspec to work with newer jekyll and match jekyll-scholar

jekyll-scholar-extras.gemspec

@@ -21,10 +21,10 @@ Gem::Specification.new do |s|
   s.required_rubygems_version = '>= 1.3.6'
   s.rubyforge_project = s.name
 
-  s.add_runtime_dependency('jekyll', '~> 0.11.2')
-  s.add_runtime_dependency('jekyll-scholar', '~> 0.1.0')
+  s.add_runtime_dependency('jekyll', '>= 0.11.2')
+  s.add_runtime_dependency('jekyll-scholar', '~> 0.3.1')
   s.add_runtime_dependency('citeproc-ruby', '~> 0.0.6')
-  s.add_runtime_dependency('bibtex-ruby', '~> 2.0.5')
+  s.add_runtime_dependency('bibtex-ruby', '~> 2.2')
 
   s.add_development_dependency('rake', "~> 0.9")
   s.add_development_dependency('rdoc', "~> 3.11")