add fraud_offset to payment API
Change psp_reference field limit

So that test notifications made from the Adyen website can work.

Currently, when testing notification Adyen sents this param:

   "pspReference" => "testnotification_NOTIFICATIONTEST"

Which unfortunately does exceed the previous 30 chars limit.
Merge pull request #55 from pjg/fix_adyen_test_notifications

Make test notifications sent from Adyen website work
Add `default_api_params` requirement to docs

Closes #41
Merge pull request #56 from pjg/doc_updates

Add `default_api_params` requirement to docs
Fix API #references call with empty recurring contracts

Previously, if you had no recurring contrancts and you executed a
`references` method to list IDs of those contracts, you would get this
error:

    NoMethodError: undefined method `map' for nil:NilClass`

This fixes that, so you'll get an empty list instead.
Merge pull request #57 from pjg/api_fix

Fix API #references call with empty recurring contracts
Released adyen gem version 1.3.2.
Merge branch 'master' into add_fraud_offset_to_api
Change event_code field limit

So that the dispute notifications from Adyen can work.

'NOTIFICATION_OF_CHARGEBACK' event_code is 26 characters long, which
exceeds current limit.
Merge pull request #62 from pjg/fix_event_code_database_field_limit

Fix dispute Adyen notifications
Fix nokogiri dependency for 1.8 and lower.
Fix typo
Use https in Gemfile.
Add support for client side encryption
Clean up fraud_offset code
[Travis] Don't try to use Rails 4 on Ruby < 1.9.3
[Travis] Also run tests on RI 2.0.0
Require RSpec 2.14.x and fix deprecations.
Merge pull request #63 from wummelkiste/master

Add support for fraud offset, client side encrypted cards