[IMP][fix_unused_imports] add function to check relative imports
[REF][fix_unused_imports] improvements in the structure of the relative imports code
[MERGE] Merge from vauxoo/master
[REF][custom_fix] Fix relative import with 2to3 script
[REF][custom_fix] Fix Typo
Merge pull request #3 from vauxoo-dev/master_relative_imports-dev-ernesto

[IMP][fix_unused_imports] add function to check relative imports