Adding NGDoc support

Fixes #288

Author: amadeus

extras/ngdocs.vim

@@ -0,0 +1,3 @@
+syntax match  jsDocTags         contained /@\(link\|method[oO]f\|ngdoc\|ng[iI]nject\|restrict\)/ nextgroup=jsDocParam skipwhite
+syntax match  jsDocType         contained "\%(#\|\$\|\w\|\"\|-\|\.\|:\|\/\)\+" nextgroup=jsDocParam skipwhite
+syntax match  jsDocParam        contained "\%(#\|\$\|\w\|\"\|-\|\.\|:\|{\|}\|\/\|\[\|]\|=\)\+"

syntax/javascript.vim

@@ -200,6 +200,10 @@ if exists("javascript_plugin_flow")
   syntax include extras/flow.vim
 endif
 
+if exists("javascript_plugin_ngdocs")
+  syntax include extras/ngdocs.vim
+endif
+
 syntax cluster jsExpression  contains=jsBracket,jsParen,jsObject,jsBlock,jsTernaryIf,jsTaggedTemplate,jsTemplateString,jsString,jsRegexpString,jsNumber,jsFloat,jsOperator,jsBooleanTrue,jsBooleanFalse,jsNull,jsFunction,jsArrowFunction,jsGlobalObjects,jsExceptions,jsFutureKeys,jsDomErrNo,jsDomNodeConsts,jsHtmlEvents,jsFuncCall,jsUndefined,jsNan,jsPrototype,jsBuiltins,jsNoise,jsClassDefinition,jsArrowFunction,jsArrowFuncArgs,jsParensError,jsComment,jsArguments,jsThis,jsSuper
 syntax cluster jsAll         contains=@jsExpression,jsExportContainer,jsImportContainer,jsStorageClass,jsConditional,jsRepeat,jsReturn,jsStatement,jsException,jsTry,jsAsyncKeyword