Use XSLT lexer

lib/linguist/languages.yml

@@ -534,7 +534,6 @@ HTML:
   - .htm
   - .html
   - .xhtml
-  - .xslt
 
 HTML+Django:
   type: markup
@@ -1325,6 +1324,12 @@ XS:
   extensions:
   - .xs
 
+XSLT:
+  type: markup
+  group: XML
+  extensions:
+  - .xslt
+
 YAML:
   type: markup
   primary_extension: .yml

test/test_language.rb

@@ -73,6 +73,7 @@ class TestLanguage < Test::Unit::TestCase
     assert_equal Lexer['TeX'], Language['TeX'].lexer
     assert_equal Lexer['Text only'], Language['Text'].lexer
     assert_equal Lexer['Verilog'], Language['Verilog'].lexer
+    assert_equal Lexer['XSLT'], Language['XSLT'].lexer
     assert_equal Lexer['aspx-vb'], Language['ASP'].lexer
     assert_equal Lexer['haXe'], Language['HaXe'].lexer
     assert_equal Lexer['reStructuredText'], Language['reStructuredText'].lexer
@@ -148,6 +149,7 @@ class TestLanguage < Test::Unit::TestCase
     assert_equal Language['Shell'], Language['Gentoo Ebuild'].group
     assert_equal Language['Shell'], Language['Gentoo Eclass'].group
     assert_equal Language['Shell'], Language['Tcsh'].group
+    assert_equal Language['XML'], Language['XSLT'].group
 
     # Ensure everyone has a group
     Language.all.each do |language|