Update TranslationWalker.php

Updated to fix issue #724 Translatable group by problem in tree walker
Merge pull request #752 from birko/patch-1

Update TranslationWalker.php
Removes double semicolon.
Merge pull request #756 from langj/fix-semicolon

Removes double semicolon.
update vendors for tests
closes #755 test case added
Allow multiple values for on="change"
add documentation for on="change" with array values
Merge pull request #759 from patkar/feature/timestampable/onchange-multiple-values

[Timestampable] multiple values with on="change"
phpdoc Fixes
Merge pull request #762 from mnapoli/phpdoc

phpdoc Fixes
update blameable to work with associations in YAML
Merge remote-tracking branch 'prostar/patch-blameable-assoc-yml'

* prostar/patch-blameable-assoc-yml:
  update blameable to work with associations in YAML
[tests] update orm config mock based on new changes
[tests] test hard relation softdelete cascade, closes #745
[sluggable] manage unique base for persisted slugs, closes #765