don't remember login if the encrypion app is enabled because the user
needs to log-in again in order to decrypt his private key with his password

Conflicts:
	core/templates/login.php
	lib/util.php
introduce OC_Util::rememberLoginAllowed()

Conflicts:
	core/templates/login.php
	lib/util.php
check every enabled app if the remember login feature needs to be disabled
set rememberlogin to false for the encryption app