[Refactoring] Handle exceptions better and add more specific error handling in CodeAnalysisBatchRunner.
[Refactoring] Add CodeIssue instrumentation.
Fix build with mono master.
[Refactoring] Run fewer concurrent threads when analyzing.
[CodeIssuePad] Show actions immediately if there is only one issue to choose from.
Merge pull request #379 from mono-soc-2013/simonl/flexible-grouping

Some improvements to the CodeIssuePad and runner.