[ErrorReport] List the installed plugins

[ErrorReportSpec] Update spec to include plugins list

[Hound] Clean up error report

[Hound] Remove explicit curly braces for hash in error report spec

[ErrorReport] Ensure plugins are sorted

Use the new CLAide::PluginsHelper method
Merge pull request #2214 from CocoaPods/error-report-plugins

[ErrorReport] List the installed plugins