Fixed typos
Merge pull request #2 from pborreli/typos

Fixed typos
Merge pull request #6 from marcw/custom-parameters

Add possibility to pass custom parameters to paypal
Merge remote-tracking branch 'origin/master'

Conflicts:
	src/OpenBuildings/PayPal/Payment.php
	src/OpenBuildings/PayPal/Payment/ExpressCheckout.php