Serialize error before sending to xray

[andyrichardson]

About

Fix #58

[coveralls]

Pull Request Test Coverage Report for Build 351

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 350:	0.0%
Covered Lines:	22
Relevant Lines:	22

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 351

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

---

Totals
Change from base Build 350:	0.0%
Covered Lines:	22
Relevant Lines:	22

---

💛 - Coveralls

[mdlavin]

Would it be possible to detect errors with circular references and only serialize those? I'm not sure about the impact of loosing the original error in the common case of non-circular errors.