Revert "Use sensible default configuration"

This reverts commit 25398336579b48c17cd8e812cacf71f7461b668c.
Fix broken specs caused by calling #for_cop for Hash instance
Fix SymbolArray cop is not properly disabled by default

This fixes #137.
Merge pull request #141 from yujinakayama/fix-symbolarray-not-disabled-default

Fix SymbolArray cop is not disabled by default