Add option to configure exception class for marking test as failed

[andrcuns]

• Add ability to provide custom exception class that marks test as failed
• Use consistent status for step and test in cucumber

Closes #529

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Allure Report

allure-report-publisher generated test report!

rspec: ✅ test report for 63feb4aa

+--------------------------------------------------------------------------+
|                            behaviors summary                             |
+---------------------+--------+--------+---------+-------+-------+--------+
|                     | passed | failed | skipped | flaky | total | result |
+---------------------+--------+--------+---------+-------+-------+--------+
| allure-cucumber     | 256    | 0      | 0       | 0     | 256   | ✅     |
| allure-rspec        | 168    | 0      | 0       | 0     | 168   | ✅     |
| allure-ruby-commons | 728    | 0      | 0       | 0     | 728   | ✅     |
+---------------------+--------+--------+---------+-------+-------+--------+
| Total               | 1152   | 0      | 0       | 0     | 1152  | ✅     |
+---------------------+--------+--------+---------+-------+-------+--------+

[codeclimate]

Code Climate has analyzed commit 63feb4a and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (80% is the threshold).

This pull request will bring the total coverage in the repository to 98.7% (-0.2% change).

View more on Code Climate.