Added cacheKeyBuilder optional argument to allow the key used for caching to be contextual.

when building cached partials that work with many different instances of the same  partial view (e.g. using the same partial more than once on a page with different ViewDataDictionary or different model), it is necessary to either name each instance differently (ugh), or not cache.

By adding an optional argument to the CachedPartial Html helper method, we can vary the cache-key depending on the context of insertion. For maximum flexibility, pass the model and the viewData to the function so it can use that data to format a cacheKey suffix.

A typical use would be something like:

@Html.CachedPartial(
"EventListings"
, FeedRepository.getFeed(new CalendarEventsModel
  {
     StartingDate = DateTime.UtcNow.Date
     , Count = 10
  })
, 0
, contextualKeyBuilder: (model, viewData) =>
  {
     return (model as CalendarEventsModel).StartingDate.ToString();
  }
)
Make CacheHelperExtensions public so we can call CachedPartialView and ClearPartialViewCache

In order to allow extensions to the logic and usage of the CachedPartial HtmlHelper, expose CachedPartialView and ClearPartialViewCache by making the wrapping static class public.
Testing the wrapping of view engines
Affect the order of domains
FFROM to FROM
Merge pull request #144 from IDisposable/patch-2

Make CacheHelperExtensions public so we can call CachedPartialView and C...
Merge pull request #143 from IDisposable/patch-1

Added contextualKeyBuilder optional argument to allow the key used for cachin...
Merge branch '6.2.0' of https://github.com/mortenbock/Umbraco-CMS into mortenbock-6.2.0

Conflicts:
	src/Umbraco.Web/WebBootManager.cs
Fixes appendformat issue
fixes some merge issues with view engine wrapping PR.
Merge branch 'wtct-U4-3071' into 6.2.0
changes casing of col names
Merge remote-tracking branch 'origin/6.2.0' into 7.0.2

Conflicts:
	src/Umbraco.Core/Profiling/ProfilingViewEngine.cs