_s[cfda009] : Better WordPress title handling for WordPress 4.1+ with proper back compat.

Merge _s[cfda009]

* Adjust todo notice for wp_title shim.
* Better title handling for WordPress 4.1. See #644.
* First pass at better title handling for WordPress 4.1+ with proper back compatibility baked in.
Merge pull request #66 from gatespace/_s_cfda009

Merge _s[cfda009] : Better WordPress title handling for WordPress 4.1+ with proper back compat.