Remove default seed value

[ilyazub]

Fixes #56
Resolves #40
Resolves #57

Changes

• Remove the default seed value (ref: Add seed parameter to turbo tests #33)
• Use exit status from RSpec calls (ref: Pass thru test-options opts to rspec to support running with Guard (for failure-exit-code) #20)

[ilyazub]

I don't like that TurboTests::Reporter almost entirely duplicates RSpec::Core::Reporter. I'll try to inherit RSpec::Core::Reporter or do something similar to avoid duplication.

[ilyazub]

We have to check message contents because RSpec outputs errors outside of examples as regular messages which we format in TurboTests::JsonRowsFormatter#message.

Ref RSpec::Core::Reporter#notify_non_example_exception: https://github.com/rspec/rspec-core/blob/5699fcdc4723087ff6139af55bd155ad9ad61a7b/lib/rspec/core/reporter.rb#L163-L170

Ref TurboTests::JsonRowsFormatter#message:

turbo_tests/lib/turbo_tests/json_rows_formatter.rb

Lines 97 to 102 in bb814e1

	def message(notification)
	output_row(
	type: :message,
	message: notification.message
	)
	end

Errors outside of examples begin with An error occurred or While loading:

• https://github.com/rspec/rspec-core/blob/5699fcdc4723087ff6139af55bd155ad9ad61a7b/lib/rspec/core/hooks.rb#L383
• https://github.com/rspec/rspec-core/blob/5699fcdc4723087ff6139af55bd155ad9ad61a7b/lib/rspec/core/example.rb#L660
• https://github.com/rspec/rspec-core/blob/5699fcdc4723087ff6139af55bd155ad9ad61a7b/lib/rspec/core/configuration.rb#L2142
• https://github.com/rspec/rspec-core/blob/5699fcdc4723087ff6139af55bd155ad9ad61a7b/lib/rspec/core/configuration.rb#L2159

And end with occurred outside of examples:

• https://github.com/rspec/rspec-core/blob/5699fcdc4723087ff6139af55bd155ad9ad61a7b/lib/rspec/core/notifications.rb#L332