Renamed `Model::tags($cacheTags)` to `Model::cacheTags($cacheTags)`
Fix to clean Validator.php

Clean code in validateAccepted(), more explicitly expresses the logic.  Update unit test to match.

Based on franzliedke suggestion from previous pull request.
Fixed wrong call to CacheManager
Merge pull request #2893 from ryanrobertsname/fix-clean-validator

Fix to clean Validator.php
Merge branch 'change/rename-model-cache-method' of https://github.com/Stayallive/framework into Stayallive-change/rename-model-cache-method
Fix test.
Merge branch 'master' of github.com:laravel/framework