u3d/available: Make Linux 2018.3.0f2 available on linux #337

[tony-rowan]

Pull Request Checklist

• My pull request has been rebased on master
• I ran bundle exec rspec to make sure that my PR didn't break any test
• I ran bundle exec rubocop to make sure that my PR is inline with our code style
• I have read the code of conduct

Pull Request Description

Fixes #337, making 2018.3.0f2 available on Linux. It does this by also searching the forum pages directly for LINUX_DOWNLOAD. It also allows the download link to be encompassed in single or double quotes.

I've tested on my Mac that u3d available -o linux responds with the latest version and extended the rspecs to cover this case. I have not yet tested on a linux system that the download and install completes successfully. I will do this when I next have access to a linux system - should be able to on Monday.

[niezbop]

Thanks for the PR @rawstacktech ! It looks good for me. Nice change with the data.scan it makes thing more readable.

Let's wait just a bit to check that this works on Linux (I'd be surprised if it doesn't though) if you have access to one, I currently don't!

[tony-rowan]

Tested it on my Linux machine, looks good. Also fixed a small typo in referencing a helper in the LinuxInstallationHelper. Looks like it only triggered when install multiple packages at a time.

[lacostej]

@rawstacktech thanks a lot for the contribution!

Really appreciated!