QmlJS: Support .import directives in js files.

* Allow .import...
* Fix parsing of JS files when using Lexer::scanDirectives()
* Clean up ImportInfo construction.
* Rename ImportInfo::id to ImportInfo::as.

Change-Id: I888da248f06dc6184db99aa74c3b50d7f2f5e491
Reviewed-on: http://codereview.qt-project.org/5625
Reviewed-by: Roberto Raggi <roberto.raggi@nokia.com>

src/libs/qmljs/qmljsbind.h

@@ -52,9 +52,11 @@ class QMLJS_EXPORT Bind: protected AST::Visitor
     Q_DECLARE_TR_FUNCTIONS(QmlJS::Bind)
 
 public:
-    Bind(Document *doc, QList<DiagnosticMessage> *messages);
+    Bind(Document *doc, QList<DiagnosticMessage> *messages,
+         bool isJsLibrary, const QList<ImportInfo> &jsImports);
     virtual ~Bind();
 
+    bool isJsLibrary() const;
     QList<ImportInfo> imports() const;
 
     ObjectValue *idEnvironment() const;
@@ -105,8 +107,8 @@ private:
     QMultiHash<QString, const ObjectValue *> _qmlObjectsByPrototypeName;
     QSet<AST::Node *> _groupedPropertyBindings;
     QHash<AST::Node *, ObjectValue *> _attachedJSScopes;
-    QStringList _includedScripts;
 
+    bool _isJsLibrary;
     QList<ImportInfo> _imports;
 
     QList<DiagnosticMessage> *_diagnosticMessages;