4.5.0 Improved @class and @override

• Print warnings for unsupported @tags.
• Allow use of @class before object literal to document all the literal members as members of the class.
• Much improved handling of @override tag.
• Auto-detection of event name when this.fireEvent("foo", ...) syntax used.
• --ext-namespaces now also effects detection of Ext.extend, Ext.override and Ext.emptyFn.
• Allow wildcard * in --external option to ignore a whole namespace.
• Ignore all builtin JS error classes in type definitions.
• Avoid waiting for fonts.google.com to load before the rest of the docs app.
• Improve loading speed of class docs.
• Allow negative numbers in type definitions.
• Fix dependency from therubyracer gem (the newest version fails to compile).