FW_Base - Wifi notifications: notify when wifi connects [1/2]

Options:
off (default)
a dry white toast
a notification
a notification with a sound

For those of us that survive on wifi islands in small college towns this
is pretty nice to have Any notification within 30 seconds of broadcast intent
ACTION_BOOT_COMPLETED will be canceled to prevent startup notification spamming. 8 (default)
of the previous connections are remembered and it will update the
notification's content accordingly if you've restored a connection.

Change-Id: I584967adedd5f00bfb9f2bc694a0b030eb622ce3
Signed-off-by: Stefano Mura [STELIX PippoX3] <ssspinni@gmail.com>