Added Invoke-Build to Build Automation

[Invoke-Build](https://github.com/nightroman/Invoke-Build) is yet another build and test automation tool implemented in PowerShell. It was inspired by Psake (in the list), implemented differently, and somewhat moved further, it is arguably easier to use and has more features.

> To stay on the list, projects should follow these quality standards:

* Generally useful to the community
    * Invoke-Build is not so popular as Psake but it does the same and more.
* Actively maintained
    * It is used by the author on daily basis in many projects, issues are resolved on the fly.
* Stable
    * Very much stable.
* Documented
    * The built-in help alone is much larger then the source code; plus wiki at the project site.
* Tests
    * A lot. Invoke-Build itself is used as the testing tool, tests are implemented as build tasks.