Add runtime version reporting to event and session payloads

[tomlongridge]

Goal

Augments reporting with the version of Ruby and integrated frameworks in use when an event occurred to aid diagnostics of version-specific bugs.

Design

Added data to device.runtimeVersions.ruby as per other notifiers.

Changeset

Changed

• configuration.rb - adds Ruby/JRuby version to new property hash runtime_version
• report.rb - adds the collected versions into the payload
• session_tracker.rb - adds the collected versions into the payload
• Updated Que, Rack, Rails, Rake, Resque and Sidekiq integrations to add version

Tests

• Augmented unit tests where appropriate
• Manually verified versions added to payload using example projects

Review

For the submitter, initial self-review:

• Commented on code changes inline explain the reasoning behind the approach
• Reviewed the test cases added for completeness and possible points for discussion
• A changelog entry was added for the goal of this pull request
• Check the scope of the changeset - is everything in the diff required for the pull request?
• This pull request is ready for:
  • Initial review of the intended approach, not yet feature complete
  • Structural review of the classes, functions, and properties modified
  • Final review

For the pull request reviewer(s), this changeset has been reviewed for:

• Consistency across platforms for structures or concepts added or modified
• Consistency between the changeset and the goal stated above
• Internal consistency with the rest of the library - is there any overlap between existing interfaces and any which have been added?
• Usage friction - is the proposed change in usage cumbersome or complicated?
• Performance and complexity - are there any cases of unexpected O(n^3) when iterating, recursing, flat mapping, etc?
• Concurrency concerns - if components are accessed asynchronously, what issues will arise
• Thoroughness of added tests and any missing edge cases
• Idiomatic use of the language

[tobyhs]

Should this target the next branch instead of master?

[tobyhs]

a few minor test code related comments, otherwise lgtm