allow "-" in Haml tags

Author: korny

Changes.textile

@@ -5,6 +5,7 @@ p=. _This files lists all changes in the CodeRay library since the 0.9.8 release
 h2. Changes in 1.1.2
 
 * C++ scanner: Added C++11 keywords. [#195, thanks to Johnny Willemsen]
+* Haml scanner: Allow @-@ in tags.
 
 h2. Changes in 1.1.1
 

lib/coderay/scanners/haml.rb

@@ -75,7 +75,7 @@ def scan_tokens encoder, options
 
           tag = false
 
-          if match = scan(/%[\w:]+\/?/)
+          if match = scan(/%[-\w:]+\/?/)
             encoder.text_token match, :tag
             # if match = scan(/( +)(.+)/)
             #   encoder.text_token self[1], :space