Merge pull request #2259 from ogail/release-0.7.3

Website slot bug fixes
add scenario test for remove web site job
scenario test for remove web job
Merge pull request #2280 from ogail/dev

Cutoff Singleton
Stop continuous job before remove
Merge branch 'dev' into Removejob
Merge pull request #2281 from WindowsAzure/dev

Merge dev into release
adsorb the api change which drops the support of -SingleTon, also add retry when try to stop a web job
adjust comment wording
address review feedback
Merge pull request #2283 from yugangw-msft/Removejob

PS sceanrio test for Remove web job
Merge pull request #2286 from WindowsAzure/dev

Merge dev into release
Scenario test for Start and Stop web job
Merge branch 'StartStopJobTest' into release-0.7.3
Merge pull request #2289 from yugangw-msft/JobSceanrioTest

Sceanrio test for start & stop web job
(Note: the merge build failure was caused by the Jenkins internal error which has happened since PR 772. Since mine is test specific change, with low risk. So I went ahead and check in
Update to use latest websites packages
Merge pull request #2291 from ogail/pkg

Update to use latest websites packages