update elements and fix some bugs

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

 (function(Prism) {
 
 var javascript = Prism.util.clone(Prism.languages.javascript);
 
 Prism.languages.jsx = Prism.languages.extend('markup', javascript);
 Prism.languages.jsx.tag.pattern= /<\/?[\w:-]+\s*(?:\s+[\w:-]+(?:=(?:("|')(\\?[\w\W])*?\1|[^\s'">=]+|(\{[\w\W]*?\})))?\s*)*\/?>/i;
 
 Prism.languages.jsx.tag.inside['attr-value'].pattern = /=[^\{](?:('|")[\w\W]*?(\1)|[^\s>]+)/i;
 
 Prism.languages.insertBefore('inside', 'attr-value',{
         'script': {
-                pattern: /=(\{[\w\W]*?\})/i,
+                // Allow for one level of nesting
+                pattern: /=(\{(?:\{[^}]*\}|[^}])+\})/i,
                 inside: {
                         'function' : Prism.languages.javascript.function,
                         'punctuation': /[={}[\];(),.:]/,
                         'keyword':  Prism.languages.javascript.keyword
                 },
                 'alias': 'language-javascript'
         }
 }, Prism.languages.jsx.tag);
 
 }(Prism));