Tests for a style of code

[it-praktyk]

I added test used to check a style of code, means

• avoid leaving trailing spaces
• avoid using tabs on the beginning of line
• leaving empty line of the end of files

[it-praktyk]

@iainbrighton , are you interested to merge this pull request? If yes I can resolve conflicts.

[iainbrighton]

@it-praktyk Absolutely, but needs the merge conflicts resolving first!