Add predis and custom lib for token management
Hide information about passwords if there was an error
Use redis storage for tokens

Tokens are now a SHA1 hash of the real SSP token and current
user email. They are stored on a redis server.

Verification URLs don't have the token visibile neither
email parameter anymore.
Remove tokens after using them
Use new token system when requesting a new password
Generate random tokens and stop using SSP Token lib
Remember and use a 'goto' URL when registering

The 'goto' parameter passed to newUser.php will be stored in redis
for that given user.

After a successful registration, a 'Log in' button will
be presented, which will ask the user to log in and
after authenticating will be redirected to the desired URL.
Make redis connection parameters configurable
Redirect the user instead of showing a button

Now the user gets automatically redirected after 5 seconds
to the 'goto' URL after a successful registration instead of
requiring him/her to do it by clicking a button.
Adapt changeMail to the new token system

Beware: still not functional
Merge remote branch 'origin/master' into redirecturl

Conflicts:
	www/changeMail.php
	www/newUser.php