[security] allow create notify token without model set.
Merge pull request #132 from Payum/notify-token-allow-null-as-model

[security] allow create notify token without model set.
Release 0.8.6
[request] add simple status request.
[doc] use simple status request in the doc.
Merge pull request #133 from Payum/simple-status-request

[request] add simple status request.
Release 0.8.7
Merge branch '0.8'

Conflicts:
	CHANGELOG.md