Additional parameters - Githubissues

We needed some additional parameters that might also benefit others:

The parameter "user" specifies the user that will run the Timer Job so that it is not necessary to log on as the service account which will run the Timer Job in the end
The parameter "skipsubwebs" will skip the warmup of all subwebs of a site collection and will only warmup the root web. This will reduce the runtime of the script and is especially beneficial if a farm has many Subsites that are used sparely.

EDIT: There are some additional changes that I added and which also implement issue #7:

Added additional triggers for warmup:
- IIS Reset (Event 3201) and AppPool Recycle Events (Events 5074-5081, 5117 and 5186)
- System Startup event
Creation of timer jobs switched to XML that has to be located next to the Script
Replaced some Write-Host commands with calls to WriteLog so that a transcript has more information and can be more helpful during debugging
Bugfixing for Web Application URLs that do not end with a slash (computed URL was missing a slash after the host and the script could not access the wrong URLs)
New parameter "skipadmincheck" that disables the permission level check at the start of the application. This flag will be automatically set for the Timer Job as there is no need for having local administrator rights just to run the warmup itself in SharePoint. Best practice is also that the farm admin service account (the most obvious candidate for running the timer job) does not have local administrative rights. In the current version, the script did not start even though the service account had the necessary permissions in SharePoint - but not on the local machines.

Unfortunately the Pull Request is now a little bigger than I anticipated, but I hope it is still worthwhile.

spjeff / spbestwarmup