Add appraisal for Rails 4.1
Detected sub directory model in `app/models`.
Explicitly require 'active_support'

Apparently [this is
required](http://edgeguides.rubyonrails.org/active_support_core_extensions.html)
and not doing it causes intermittent load errors in Rails 4.1
handle unset collection columns persisted records
Adding support for key default values just like columns

fix #96
Ensure empty attributes are set correctly in new and hydrated records

E.g. if a list column is not populated, the result row from the adapter will
return `nil`. From `Cequel::Record`'s standpoint, though, an empty list column
is always an empty `Array`, not `nil`. This was previously enforced in the
`read_attribute` method, but that caused infinite recursion in some situations
due to behavior ActiveModel::Dirty implements for `write_attribute`.
Set key default even if it's falsy

E.g. if it's `false`. Pretty unlikely but seems more correct.
Merge branch 'DotLinker-add_key_defaults'

* DotLinker-add_key_defaults:
  Set key default even if it's falsy
  Adding support for key default values just like columns
Update authors
Escape directory path
Update authors
Merge branch 'kusakari-master'

* kusakari-master:
  Update authors
  Escape directory path
  Detected sub directory model in `app/models`.

Conflicts:
	README.md
	cequel.gemspec
Bump version
Disable rubocop

It keeps breaking
Restore RuboCop, lock in version