Skeleton work for the health dialog.
Health dialog with entry points from the toolbar and statusbar.
Adding a simple benchmark for computing the overhead of wtf.now.
Calculating health info and displaying it in the dialog.
Embedding the now() benchmark into files.
Adding an overhead estimate.
More accurate computeNowOverhead test by running a few times.
Merge pull request #267 from google/shame

Adding a 'health' tracker for warning the user about bad instrumentation.