Removed unused test for DateTime.local_offset

see discussion here #11274
Added an `enforce_utf8` hash option for `form_tag` method

Control to output a hidden input tag with name `utf8` without monkey
patching

Before:

    form_tag
    # => '<form>..<input name="utf8" type="hidden" value="&#x2713;" />..</form>'

After:

    form_tag
    # => '<form>..<input name="utf8" type="hidden" value="&#x2713;" />..</form>'

    form_tag({}, { :enforce_utf8 => false })
    # => '<form>....</form>'
Merge pull request #11274 from arunagw/deprecation-removed-build-fixed

Deprecation removed build fixed
Refactored strong paramters usage and updated Gemfile.lock with Rails 4
Merge pull request #11317 from ma2gedev/enforcer_tag_option

Added an `enforce_utf8` hash option for `form_tag` method
Merge pull request #11347 from ankit8898/refactoring-sp

Refactored strong parameters usage and updated Gemfile.lock with Rails 4