Coding standards

[lenardpalko]

Break from issue #23 :

viliam-husar : fix coding standards
khepin : CS: sure, would be good

[lenardpalko]

I've added some fixes so the code follows PSR2 standard : #60

Would you like to add something else ?

[lenardpalko]

I've also found a really good tool for CS Style checks https://styleci.io, I've integrated in this commit the feedbacks from this tool also.

@khepin : What do you think for adding styleci as a webhook so it runs on every PR ?

Thanks