* Merge GSNContext into GSNRecipient
* Update GSNRecipient.test.js
* Update GSNRecipient.sol
* Make GSNRecipient inherit from Context
(cherry picked from commit 1efa9f6281)
* Merge GSNContext into GSNRecipient
* Update GSNRecipient.test.js
* Update GSNRecipient.sol
* Make GSNRecipient inherit from Context
(cherry picked from commit 1efa9f6281)