codehilite: detect languages with funny names (#527)

Extend the language regex to match things like 'C#' and 'VB.Net'.

Author: grantisu

markdown/extensions/codehilite.py

@@ -166,7 +166,7 @@ def _parseHeader(self):
  c = re.compile(r'''
  (?:(?:^::+)|(?P<shebang>^[#]!)) # Shebang or 2 or more colons
  (?P<path>(?:/\w+)*[/ ])? # Zero or 1 path
- (?P<lang>[\w+-]*)  # The language
+ (?P<lang>[\w#.+-]*) # The language
  \s* # Arbitrary whitespace
  # Optional highlight lines, single- or double-quote-delimited
  (hl_lines=(?P<quot>"|')(?P<hl_lines>.*?)(?P=quot))?