Centralize specification of bundled agents

[CharliePoole]

Agents bundled with the console runner as dependencies must have their versions specified...

1. In the definition of the NuGet runner package in build.cake.
2. In the definition of the Chocolatey package in build.cake.
3. In the nuspec files for each of those packages.

This leads to errors, which are hard to debug. Ideally, we should be able to specify a single list of bundled extensions for the build. Changes will be needed in the cake recipe in order to support this.

[CharliePoole]

This issue has been resolved in version 4.0.0-beta.2

The release is available on:
GitHub.
NuGet packages are also available NuGet.org and
Chocolatey Packages may be found at Chocolatey.org