Upgrade to PayPal mSDK 2.6.0
Update usage deprecated PayPalTouch API
Update CHANGELOG for PayPal bug fix
Update CHANGELOG for PayPal SDK 2.6.0 upgrade
Merge pull request #82 from braintree/feature/paypal-2.6.0

Upgrade to PayPal mSDK 2.6.0
Remove xctool_wrapper from Rakefile

Also:
* Switch to just simple command composition for easier maintainability.
* Fix broken UI build/test tasks with bad scheme name.
* Specify simulator destination more explicitly.
Update CHANGELOG entry date for 3.4.1