Few fixes and enhancements

- Upgraded versions of components used
- Fixed issue with shellinabox
- Minor tweaks to the UI
- Added a set of scripts to be used in development mode. The dev scripts are same as production scripts except that they don't enforce installation of system components. The developer can set them up as he wishes. It however creates a `host/install` folder which becomes the work directory for development. With some more modifications, this can be merged with the production scripts in the future.
- The ijulia image name can be customized (useful while upgrading to newer versions)