CS/CI updates, Makefile switch

[sanmai]

• CI/CS changed to use Makefile, no need to remember any commands - just type make and everything is done for you.
• Deprecating PHP_CodeSniffer in favor of superior PHP-CS-Fixer; the latter won't scold poor coding practice, but instead fix all CS violations for you. You can code as you like, forget about cleaning imports, etc.
• Added a license header to all files, required by the license.
• Added two static analyzers in a recommendation mode, and mutation testing tool - it will automatically tell if tests isn't good enough. These are not causing a build failure yet.

Please let me know if this change is to your liking. I tried to keep code change to minimum to simplify review, more drastic changes will be coming next for a closer inspection.

[henrique-borba]

It's great @sanmai. I still have to read more about the mutations, I didn't know it and it looks very useful.

SciBoard has no description, but basically it will be a kind of IPython / Jupyter built into PHPSci. I was thinking of creating a stable version of SciBoard after the release of version 0.1 (both extension and library), the primary architecture is still crap so we're probably going to rebuild SciBoard from the beginning.

Now about the library, I have some questions:

• I get the impression that I was somewhat abusive with the traits.
• The library does not have a standard to perform operations, for example to transform using Transpose, the function is called directly by trait Transformable, now if you use a function of the LinearAlgebra package, it will use instantiation of objects and separate operations by types , like ProductOperations.php - This seems like something we need to standardize before we move on. It would be nice if you take a look at this.

PS: I just sent the first successful instantiation test using the static toArray method. Now that it works, I will implement it in the other functions so we finally get rid of that uuid, x, y mess.

[sanmai]

True, traits are not making things easier to understand, but I'm not concerned about them much because it seems like everything can become a lot leaner if there will be no need to track dimensions and UUIDs in most places. Making toArray taking an instance is a good step in that direction.

[sanmai]

Here's a great intro to mutation testing.