added SOAP call in AppController to gather logs from all machines
added skeleton frontend to download logs if user is a cloud admin
disabling admin login for log downloading
js script to catch the status of log gathering, once 200 is received download button appears
Merge remote-tracking branch 'org/testing' into download-logs-in-dashboard
Merge pull request #569 from AppScale/download-logs-in-dashboard

Download logs in dashboard