Revert "Remove Unity3D (#517)"

This reverts commit 95390be.

Dockerfile

@@ -35,6 +35,7 @@ ADD tests/data/spring.io.crt /usr/local/share/ca-certificates/
 ADD tests/data/dl.google.com.crt /usr/local/share/ca-certificates/
 ADD tests/data/sublimetext.com.crt /usr/local/share/ca-certificates/
 ADD tests/data/download.sublimetext.com.crt /usr/local/share/ca-certificates/
+ADD tests/data/forum.unity3d.com.crt /usr/local/share/ca-certificates/
 ADD tests/data/bitbucket.org.crt /usr/local/share/ca-certificates/
 ADD tests/data/go.microsoft.com.crt /usr/local/share/ca-certificates/
 ADD tests/data/download.jetbrains.com.crt /usr/local/share/ca-certificates/

tests/data/forum.unity3d.com.crt

@@ -0,0 +1,22 @@
+-----BEGIN CERTIFICATE-----
+MIIDlTCCAn2gAwIBAgIJAOcA0CcbaV7cMA0GCSqGSIb3DQEBCwUAMGExCzAJBgNV
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+NHSTiHAZfG9J
+-----END CERTIFICATE-----

tests/data/forum.unity3d.com.pem

@@ -0,0 +1,50 @@
+-----BEGIN PRIVATE KEY-----
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+-----END PRIVATE KEY-----
+-----BEGIN CERTIFICATE-----
+MIIDlTCCAn2gAwIBAgIJAOcA0CcbaV7cMA0GCSqGSIb3DQEBCwUAMGExCzAJBgNV
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+NHSTiHAZfG9J
+-----END CERTIFICATE-----

tests/data/server-content/beta.unity3d.com/download/e06241adb51f/public_download.html

@@ -0,0 +1,8 @@
+
+<html><head><meta http-equiv='content-type' content='text/html; charset=UTF-8'></head><body><h2>Unity 5.5.2xf1Linux Linux Editor downloads</h2>
+<p>Welcome to the Linux Editor download repository.  Here, you will find the download links to experimental releases of the Linux Editor.</p>
+<h3>Debian Package</h3>
+<a href='http://beta.unity3d.com/download/e06241adb51f/./unity-editor_amd64-5.5.2xf1Linux.deb'>Linux Editor Installer (.deb package)</a><br>
+<h3>Platform-Agnostic Self-Extracting Shell Script</h3>
+<a href='http://beta.unity3d.com/download/e06241adb51f/./unity-editor-installer-mock.sh'>Linux Editor Installer (self-extracting shell script)</a><br>
+</body></html>