Add :timeout? attribute to the status returned by ProcessExecuter.spawn

[jcouball]

In this PR, the ProcessExecuter.spawn was changed to return a ProcessExecuter::Status instead of a Process::Status. The former is a SimpleDelegator to the latter adding a timeout flag to the initializer and adding a timeout? attribute.

ProcessExecuter.spawn was changed to note if the subprocess it spawns timed out or not in the returned ProcessExecuter::Status object.

Example:

require 'process_executer'

status = ProcessExecuter.spawn('sleep 10', timeout: 0.01)
status.signaled? #=> true
status.termsig #=> 9
status.timeout? #=> true

[codeclimate]

Code Climate has analyzed commit e414135 and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (50% is the threshold).

This pull request will bring the total coverage in the repository to 100.0% (0.0% change).

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