Fixed an issue with one to many relations

As described in #2325
Merge pull request #2358 from net02/patch-3

Fixed an issue with one to many relations
Fixed typo in tab menu template
Merge pull request #2373 from Bladrak/fix_typo

Fixed typo in tab menu template
Removed problematic overflow CSS rules for ".box .box-body" in layout.css
Merge pull request #2374 from pulzarraider/overflow_fix

Removed problematic overflow CSS rules for ".box .box-body" in layout.css
updated ignore files added idea files to ignore list
Merge branch 'sonata-master'