MB-100: really hide hidden submit on 1st step of wizard

Initially this button was visibility:hidden, but we found it prevents
Enter from submitting form on IE. See
b01dd0ec933eb69257fd635d37609d6521463da1.

But clearly just forcing it to have 0 width and height doesn't
completely hide it due to possibly non-zero border, padding and
margin. But fixing that is easy too.

Change-Id: I60c9de04efbaac5b20e802d8fe3a670ed45c5b43
Reviewed-on: http://review.couchbase.org/26610
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Reviewed-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>
MB-100: wait long enough for child processes shutdown

We spotted that we waited for memcached only for 1E6 milliseconds
which is less than we thought. We found it was caused by
supervisor_cushion timeout which makes sense to bump to infinity.

Change-Id: Ifc4751ab0b4e44648918a5c291be6299d3cf95db
Reviewed-on: http://review.couchbase.org/26651
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Reviewed-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>
MB-100: fixed funny typo in CHANGES

Change-Id: I594fa112cc2b383c6d27d5eee90b4aff56386342
Reviewed-on: http://review.couchbase.org/26652
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Reviewed-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>