wip
[order] add stripe capture order action service.
[order] register one capture order action, and fill order details action per payment.
[order] add support of offline and omnipay payments.
[order][paypal-pro] add support of fill order details action.
[order][payex] add fill order details action.
[order] add tests.
[order] update readme.
[order][doc] update get it started.
[order][doc] simple examples -> custom examples.
[paypal-ec] inject token factory to allow auto notifyurl set.
fix doc
fix doc.
Merge pull request #180 from formapro-forks/order

[PoC][orders] Unified way to process payments
fix broken link
[doc] fix typo
remove broken link
prepare for release 0.12
Release 0.12.0
master is 0.13 now.