Added remote URL for a task

Remote command execution works

Added terminate

Remote exec works by passing SSH key

Fixed error handling for remote processes

Added stderr, fixed formatting and support DSS and RSA
Better UI for job detail page, support password and ssh key, added remote tab to update remote host

Removed comment and added an issue for better schema management
Merge branch 'master' of https://github.com/utkarsh2012/dagobah