added curl support for codes that are not hosted in repositories

[denizural]

Together with the pull request in the esm_tools, it is now possible to download codes that are not hosted in repositories (eg. GitHub, GitLab, svn, mercurial, ...). Here is a quick example:

esm_master get-tux-1.0
esm_master comp-tux-1.0
esm_master clean-tux-1.0

or esm_master install-tux-1.0.

Make sure that your X11 settings are on 😄

[nwieters]

Will you merge this also to develop?

[denizural]

Hi @nwieters, sorry for the late response. I merged everything (tools and master) into both release and develop. Now, you can use them

[nwieters]

Thank you.