WebStyle: workaround for broken per MSIE 9.0

• MSIE < 9.0 browsers have some known bugs in handling caching headers (no-store, no-cache) over SSL (see: http://support.microsoft.com/kb/323308). These headers are disabled when serving content to these browsers.

• MSIE < 9.0 is also sometimes confuesed with inline content-disposition and with not supported content-type. Workarounds for these issues are also provided.