rose suite-run: wait for `cylc run` to complete.

cylc/cylc#252 means that we are no longer required to run `cylc run` in
`nohup` and have its standard output and error redirected.
Merge pull request #368 from matthewrmshin/cylc-run

rose suite-run: wait for `cylc run` to complete.
Merge branch 'master' into gh-pages