update elements and fix some bugs

lib/src/prism/components/prism-objectivec.min.js

-Prism.languages.objectivec=Prism.languages.extend("c",{keyword:/(\b(asm|typeof|inline|auto|break|case|char|const|continue|default|do|double|else|enum|extern|float|for|goto|if|int|long|register|return|short|signed|sizeof|static|struct|switch|typedef|union|unsigned|void|volatile|while|in|self|super)\b)|((?=[\w|@])(@interface|@end|@implementation|@protocol|@class|@public|@protected|@private|@property|@try|@catch|@finally|@throw|@synthesize|@dynamic|@selector)\b)/,string:/(?:("|')([^\n\\\1]|\\.|\\\r*\n)*?\1)|(@"([^\n\\"]|\\.|\\\r*\n)*?")/,operator:/[-+]{1,2}|!=?|<{1,2}=?|>{1,2}=?|\->|={1,2}|\^|~|%|&{1,2}|\|?\||\?|\*|\/|@/});
+Prism.languages.objectivec=Prism.languages.extend("c",{keyword:/\b(asm|typeof|inline|auto|break|case|char|const|continue|default|do|double|else|enum|extern|float|for|goto|if|int|long|register|return|short|signed|sizeof|static|struct|switch|typedef|union|unsigned|void|volatile|while|in|self|super)\b|(@interface|@end|@implementation|@protocol|@class|@public|@protected|@private|@property|@try|@catch|@finally|@throw|@synthesize|@dynamic|@selector)\b/,string:/("|')(\\(?:\r\n|[\s\S])|(?!\1)[^\\\r\n])*\1|@"(\\(?:\r\n|[\s\S])|[^"\\\r\n])*"/,operator:/-[->]?|\+\+?|!=?|<<?=?|>>?=?|==?|&&?|\|\|?|[~^%?*\/@]/});