drush make doesn't download everything

[holtzermann17]

I installed planetary_libs from commit 5128b9c63643fea95bc7e955f8093dc184f0a19e

drush -y en planetary_libs
drush make sites/all/modules/planetary_libs/planetary_libs.make --no-core

But I needed to do the following steps in order to get all the packages downloaded and available to Drupal:

cd sites/all/libraries
mkdir jquery.terminal
cd jquery.terminal
wget -O master.tar.gz https://github.com/jcubic/jquery.terminal/tarball/master
tar -zxvf master.tar.gz
mv jcubic-jquery.terminal-50bd0a0/* .
cd ..
mkdir jquery.layout
cd jquery.layout
wget http://layout.jquery-dev.net/lib/js/jquery.layout-latest.min.js
cd ..
cd requirejs
wget http://requirejs.org/docs/release/2.1.5/minified/require.js

Can drush make be configured to do this automatically?

[dginev]

Related to #88 (to the extent that an easy install should be a goal of #88 to ensure a well-documented installation process).