APIs for WebJobs, Functions, SiteExtensions and Processes (#1551)

* Microsoft.Web Adding WebApps documentation
* add deployments/log
* add webjobs, continuouswebjobs, triggeredwebjobs
* add siteextensions
* add processes, instance/processes Diagnostics
* add functions, functions/listsecrets, listsyncfunctiontriggerstatus

* Update with review feedback from pull request #1551

* Update #2 with review feedback from pull request #1551

* Update #3 with review feedback from pull request #1551

* Update #4 with review feedback from pull request #1551

* Update #5 with review feedback from pull request #1551

* Fix merge issues.