#176 only include or exclude relative to source

[mbao01]

• Refactor code for including and excluding files
• Updated tests
• Allow all exclusion and inclusion relative to source directory

[mbao01]

@yegor256 please review

[yegor256]

@rultor merge

[rultor]

@rultor merge

@yegor256 OK, I'll try to merge now. You can check the progress of the merge here

[rultor]

@rultor merge

@yegor256 Done! FYI, the full log is here (took me 6min)

[yegor256]

@mbao01 thanks!