Feat/unittests

[thefirstfloor]

Looked at it, seems legit. Added docu so it's clear what is tested.
We might want to extend it with more tests.

[eioe]

pls only commit relevant files. A lot is going on here, including adding new scripts of which is unclear what they are needed for (e.g., Rotator.cs). Very difficult to review.

The actual tests look either trivial or pretty opaque to me.
trivial:

var package = new EyeDataPackage();
package.eye = "left";
...
Assert.AreEqual("left", package.eye);

opaque:

var propertyInfo = typeof(EyeDataHandler).GetProperty("_currentSamples", BindingFlags.NonPublic | BindingFlags.Instance);
var currentSamples = (List<EyeDataPackage>)propertyInfo.GetValue(_handler);

No offense, but I cannot merge this with a clear conscience.

[thefirstfloor]

@eioe What does closed mean?
I did not have any time to read and investigate into your comment. Please don't shut doors too enthousiasticly.