Added command line option to use try.pixelated-project.org as default.
Added command line option to use try.pixelated-project.org as default.

- If option -p is not specified, the caller is asked for leap params
  like hostname
- Issue #63

PuZZleDucK/pixelated-platform,PuZZleDucK/pixelated-platform,PuZZleDucK/pixelated-platform,pixelated/puppet-pixelated,pixelated/puppet-pixelated,pixelated/puppet-pixelated,PuZZleDucK/pixelated-platform,pixelated/puppet-pixelated