Add tail option to log task
Add tail option to log task

This option uses the ability of the tail command to display
continuous new entries in the logs, usefull to follow deployement
process.

    git deploy log --tail
    git deploy log -t

verylucky/git-deploy,mislav/git-deploy,verylucky/git-deploy,andrey-str/git-deploy,berfarah/git-deploy,andrey-str/git-deploy,berfarah/git-deploy,mislav/git-deploy