Merges pull requests 4 (by leanucci) and 6 (by cav21).

- Implemented basic access to the collection search method;
- Changed the test credentials;
- Added documentation for collection search;
- Using Ruby 1.9 hash format;
- Version bump.
Adds refresh_access_token to the authentication module.
Added credits to Readme
Request uses Faraday instead of RestClient for better SSL support.
Updates README.md
Added .ruby-version to .gitignore.
Not all exceptions come with a #response method. If the Exception does not have that method, continue to raise the Exception.
Merge pull request #9 from ombushop/ignore-ruby-version

Added .ruby-version to .gitignore.
Merge pull request #10 from ombushop/support-exceptions-without-response

Support exceptions without a #response method
Added functionality to create and get recurring payments.

Added functionality to create and get recurring payments.
Added functionality to search recurring payment by IPN.

Added functionality to search recurring payment by IPN.
Update to readme.

Update to readme.
Add support to 'merchant order' notifications
Update url to collection in method notification_preapproval

Update url to collection in method notification_preapproval.
Update readme

Update readme.
Update readme

Update readme.
Update readme

Update readme.
Update readme

Update readme.
Revert "Update readme"

This reverts commit dc9ecf7222e3a155134051cc60721eafd90f5f90.
Revert "Revert "Update readme""

This reverts commit fdfea7305c02b31deed10779bc74d37416b1cc09.