Issue 138: juicer-admin show-repo usage incorrect

Url: https://github.com/juicer/juicer/issues/138
-Explicitly states  the usage and positioning of --in option
Signed-off-by: Ameya Sathe <aakreet40-rhce@yahoo.com>

Please merge this commit into the master branch to fix the Issue 138 seen in version 0.6.1 of juicer-admin