No need to cache feed items via transient here

I believe this was, in retrospect, an accidental hold over from reusing
the code from the feed retrieval process and was never needed. Via #325
SimplePie does this caching, no need for us to do so.
Final transient removal to resolve #325
Insure global for wp_rewrite is in place

needed for upgrade.
Static class means static access

Static classes are fun, especially when I don't screw them up.
Seriously, gotta fix that static access.
fix for how we call the alert-box status type
Version update notation.
Prep for merge.
Switch to the new standard syndication tag

Canonical tag now. Resolves #322
Merge pull request #327 from PressForward/3.3.x

3.3.x - better performance through less transients