Fixes #1017: Running BLT commands in Drupal VM requires bz2; update to Drupal VM 4.2.x.

[geerlingguy]

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[geerlingguy]

Still testing... now I'm getting "../acquia/blt/bin/blt: not found" :/

[geerlingguy]

Weird, it seems all kinds of blt commands are trying to find paths like ../phing/phing/bin/phing or ../acquia/blt/bin/blt, but when I check, all those folders and executables exist and work independently in the right paths inside the vendor directory.

This PR is still needed... but I'm hitting a wall at this point in my quest to set up instructions for doing literally everything (from no project to full BLT project) within Windows only.

[geerlingguy]

Turns out I had to reboot entirely, and now I can delete that folder from within Ubuntu Bash, using sudo rm -rf vendor.

[geerlingguy]

And I wasn't running Cmder as administrator, so symlinks were all catawampus.

[geerlingguy]

And I finally have a fully functional huge set of instructions from going to no project to fully-functional BLT project with Drupal VM on Windows that I'll do a screencast of, then post to my blog. I didn't know if it would be possible, but you can actually do every single thing inside Windows 10 native environment.

[geerlingguy]

(As long as this PR is merged, that is).

[geerlingguy]

Tagged a new Drupal VM release so this change works correctly.

[geerlingguy]

...and here's a blog post on the entirety of the process, along with a splendiferous video: https://www.jeffgeerling.com/blog/2017/set-blt-and-drupal-vm-entirely-within-windows-10