update elements and fix some bugs

lib/src/prism/components/prism-markup.js

 Prism.languages.markup = {
         'comment': /<!--[\w\W]*?-->/,
         'prolog': /<\?[\w\W]+?\?>/,
         'doctype': /<!DOCTYPE[\w\W]+?>/,
         'cdata': /<!\[CDATA\[[\w\W]*?]]>/i,
         'tag': {
-                pattern: /<\/?[^\s>\/]+(?:\s+[^\s>\/=]+(?:=(?:("|')(?:\\\1|\\?(?!\1)[\w\W])*\1|[^\s'">=]+))?)*\s*\/?>/i,
+                pattern: /<\/?[^\s>\/=.]+(?:\s+[^\s>\/=]+(?:=(?:("|')(?:\\\1|\\?(?!\1)[\w\W])*\1|[^\s'">=]+))?)*\s*\/?>/i,
                 inside: {
                         'tag': {
                                 pattern: /^<\/?[^\s>\/]+/i,
                                 inside: {
                                         'punctuation': /^<\/?/,
                                         'namespace': /^[^\s>\/:]+:/
                                 }
                         },
                         'attr-value': {
                                 pattern: /=(?:('|")[\w\W]*?(\1)|[^\s>]+)/i,
@@ skipping 14 matching lines @@
         'entity': /&#?[\da-z]{1,8};/i
 };
 
 // Plugin to make entity title show the real entity, idea by Roman Komarov
 Prism.hooks.add('wrap', function(env) {
 
         if (env.type === 'entity') {
                 env.attributes['title'] = env.content.replace(/&amp;/, '&');
         }
 });
+
+Prism.languages.xml = Prism.languages.markup;
+Prism.languages.html = Prism.languages.markup;
+Prism.languages.mathml = Prism.languages.markup;
+Prism.languages.svg = Prism.languages.markup;