[MERGE] [ADD] module: payment_buckaroo acquirer: manage payments using Buckaroo.

addons/payment/models/res_config.py

addons/payment/views/res_config_view.xml

addons/payment_buckaroo/__init__.py

addons/payment_buckaroo/__openerp__.py

addons/payment_buckaroo/controllers/__init__.py

addons/payment_buckaroo/controllers/main.py

addons/payment_buckaroo/data/buckaroo.xml

addons/payment_buckaroo/models/__init__.py

addons/payment_buckaroo/models/buckaroo.py

addons/payment_buckaroo/static/description/icon.png

addons/payment_buckaroo/static/src/img/buckaroo_icon.png

addons/payment_buckaroo/static/src/img/logo.png

addons/payment_buckaroo/tests/__init__.py

addons/payment_buckaroo/tests/test_buckaroo.py

addons/payment_buckaroo/views/buckaroo.xml

addons/payment_buckaroo/views/payment_acquirer.xml