various changes; added Cancellation API#5

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mihai-aupeo wants to merge 5 commits intopaymentwall:masterfrom pna-smo-oc-archive:master

+751-544

Commits on Feb 27, 2015

* code style changes for Ruby
mihai-aupeo
committed

Commits on Mar 10, 2015

Commits on Mar 24, 2015

* fixed Pingback signature validation
mihai-aupeo
committed

Commits on Apr 8, 2015

* fixed signature calculation; methods are different
mihai-aupeo
committed