add destroyed? & move to_key/persisted? into ARTrickery
remove comments
Fix typo in #last_request_update_allowed? example

The previous version would always return false.
Fixed destroying cookies on sinatra
add Appraisal to test against Rails 3 and Rails 4

```
rake appraisal:install
rake appraisal
```

[Appraisal](https://github.com/thoughtbot/appraisal)
configuration for Travis.ci
test against final rails 4.0 release
Fix Rails 4 #with_scope deprecation-warning
update list of ICANN TLDs with > 4 characters
update Appraisal for Rails 3.2.14
Merge pull request #368 from GetJobber/appraisal

Let's start testing against Rails 3 and Rails 4
Merge pull request #369 from AKoetsier/master

Fixes Rails 4 #with_scope deprecation-warning
Merge pull request #370 from MDaubs/gtlds

Update e-mail regex to be compatible with new gTLDs
Merge pull request #366 from leejones/fix-typo-in-example

Fix typo in #last_request_update_allowed? example
Merge pull request #367 from alexyakubenko/fix_sinatra_delete_cookie

Fixed destroying cookies on sinatra
Merge pull request #363 from tiegz/trickery_fix

ActiveRecordTrickery fix
Bugfix for ruby <2.0 (UTF-8 encoding needed)

Bugfix for invalid multibyte char (US-ASCII).
Merge pull request #373 from keepinmind/patch-1

Bugfix for ruby <2.0 (UTF-8 encoding needed)