Add the 'struct' keyword to Julia (#1941)

Added to the key word list and updated tests.

components/prism-julia.js

@@ -4,7 +4,7 @@ Prism.languages.julia= {
 		lookbehind: true
 	},
 	'string': /("""|''')[\s\S]+?\1|("|')(?:\\.|(?!\2)[^\\\r\n])*\2/,
-	'keyword' : /\b(?:abstract|baremodule|begin|bitstype|break|catch|ccall|const|continue|do|else|elseif|end|export|finally|for|function|global|if|immutable|import|importall|in|let|local|macro|module|print|println|quote|return|try|type|typealias|using|while)\b/,
+	'keyword' : /\b(?:abstract|baremodule|begin|bitstype|break|catch|ccall|const|continue|do|else|elseif|end|export|finally|for|function|global|if|immutable|import|importall|in|let|local|macro|module|print|println|quote|return|struct|try|type|typealias|using|while)\b/,
 	'boolean' : /\b(?:true|false)\b/,
 	'number' : /(?:\b(?=\d)|\B(?=\.))(?:0[box])?(?:[\da-f]+\.?\d*|\.\d+)(?:[efp][+-]?\d+)?j?/i,
 	'operator': /[-+*^%÷&$\\]=?|\/[\/=]?|!=?=?|\|[=>]?|<(?:<=?|[=:])?|>(?:=|>>?=?)?|==?=?|[~≠≤≥]/,

tests/languages/julia/keyword_feature.test

@@ -8,6 +8,7 @@ immutable import importall in
 let local macro module
 print println quote
 return try type
+struct
 typealias using while
 
 ----------------------------------------------------
@@ -23,6 +24,7 @@ typealias using while
 	["keyword", "let"], ["keyword", "local"], ["keyword", "macro"], ["keyword", "module"],
 	["keyword", "print"], ["keyword", "println"], ["keyword", "quote"],
 	["keyword", "return"], ["keyword", "try"], ["keyword", "type"],
+	["keyword", "struct"],
 	["keyword", "typealias"], ["keyword", "using"], ["keyword", "while"]
 ]