AngularJS: MB-11954: existing default bucket during wizard setup

Change-Id: If2f00b95a4b232c7b7744c58ccbaa61641ec6b01
Reviewed-on: http://review.couchbase.org/40619
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
AngularJS: use serializeData for converting params to xhr format

Change-Id: If58e141f8f0fb932cdfa3d2395ceaec0bbad8473
Reviewed-on: http://review.couchbase.org/40697
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
AngularJS: relooking of spinner directive

Change-Id: I4b209c042783bb1c5b7ee98258d257d7818452c5
Reviewed-on: http://review.couchbase.org/40698
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>