Enclose download URL in single quotes

Solves an issue trying to install a package with an ampersand in the URL
Support newer ansible versions.

In 1.8 ansible changed the way they found the default module path, from returning a string to returning None.
This breaks battleschool, expecting ansible to return a string.

This change makes battleschool compatible with both pre and post 1.8 ansible.
Merge branch 'lndbrg-patch-1' into devel
Merge branch 'acaire-patch-1' into devel
updated to version 0.4.0