Refactor to use go-metrics
Convert more metrics
Simplify counter export
Add new templates
Report exceptions
Add iframe tasks
Merge branch 'master' into metrics
Let us disable task groups
fix bugs in tests
Merge branch 'master' into metrics
Add version module.

Fixes #1.
Merge branch 'master' into metrics
add safeguards when restarting
New certificate after heartbleed
Add debug server
make version enforcement more graceful
Print error message when version is missing
Record more timings for iframe-cache
Send iframe and img times separately
Don't send cmh-message if null