Added a few session alias/helper methods
Allows cleaner access to flash and private data
Added 2 more alias methods for session::has()
Added: flashHas() and privateHas()
Fixed typo
Fixed another small typo in a PHPdoc block
Forgot to make $default optional for alias get methods
Added old flash data to session::get()
If we're explicitly looking in flash, also look in old flash
Added logout support
Just build the logout link with the GET var `logoutToken` and set it to the value provided by session::logoutToken()
Then on the next request, when session starts up, it looks to see if that var is present, and (if correct) will reset the session
Merge pull request #14 from wvulibraries/sessionLogout

Session logout