[Runtime] Enable WARP for WGT package

The Widget Access Request Policy (WARP) specification is a security
mechanism to control network access from within a widget application, as
well as a method for authors to request that the user agent grant access
to certain network resources or sets thereof by setting access tag in
widget config.xml file. e.g.
<access origin="http://www.sample.com" subdomains=true />

This will grant to access permission for all resources under
"http://www.sample.com" such as "http://www.sample.com/icon.png".

Using <access origin="*" /> will enable all network access. By default,
if no access tag is given in config.xml, only local widget resources can
be accessed.

The reference link is http://www.w3.org/TR/widgets-access/.