add missed parameters.
add constraint on amount not to be greater then 2
prepare release.
switch master to 0.4-dev.
reorganaize demos. create self bundle for paypal examples.
use Statis::isPending
init demo for paypal recurring payments
update recurring payment demo controller
tweak recurring payment example.
Merge pull request #2 from Payum/paypal-recurring-payment

[paypal express checkout] suppor of recurring payments
Update composer.json
[paypal] use SyncRequest to get recurring payment details