Add improved javascript syntax plugin

Used https://github.com/vim-scripts/JavaScript-syntax
todo: take a look at https://github.com/8bitDesigner/JavaScript-syntax

.gitmodules

@@ -55,3 +55,6 @@
 [submodule "vim/bundle/scss-syntax"]
 	path = vim/bundle/scss-syntax
 	url = https://github.com/cakebaker/scss-syntax.vim.git
+[submodule "vim/bundle/javascript-syntax"]
+	path = vim/bundle/javascript-syntax
+	url = https://github.com/vim-scripts/JavaScript-syntax.git

vim/bundle/javascript-syntax

@@ -0,0 +1 @@
+Subproject commit e24f4aa35f7d8c18cef41bc4cc76f52db5327f80