Core.EnumerableExtensions - refactor InGroupsOf to enumerate source only once
Core.StringExtensions - switch over to the new DefaultShortStringHelper
Wrap all ViewEngines in a profiler

Wrap all ViewEngines in a custom profiler view engine, using the
ProfilerResolver to track performance
Make sure the profilingengine doesn't wrap itself
Merge pull request #146 from mortenbock/6.2.0

Custom ProfilingViewEngine
Finally got around to changing all calls to umbraco.IO to Umbraco.Core.IO - that'll clear up several hundreds of warnings :)
Merge branch '6.2.0' of https://github.com/umbraco/Umbraco-CMS into 6.2.0