Update Podfile Specta entry to use :commit

Also remove CocoaPods builds steps and regenerate
Add static analysis step to our -Braintree pod targets and all demos/specs
Remove unused value (detected via static analysis)
Fix memory leak (detected via static analysis)
Call super methods appropriately (found via static analysis)
Fix null dictionary values, and remove possibility of nil value

Issue detected via static analysis
Prevent use of nil value in dictionary by returning early and logging the issue

Issue detected via static analysis
Remove unused pinned cert subjects and public keys

Detected as a dead store issue via static analsysi
Fix demo app entitlements and missing path build warnings
Remove stray output from Podfile post_install step
Expose shipping and billing details in BTApplePayPaymentMethod, the result of saveApplePayPayment
Add tokenizeApplePayPayment:completion: to Braintree class
Remove BTClientApplePayRequest in favor of bare PKPayment
Revise BTPaymentProvider header docs
Add support for overriding supported networks via BTPaymentProvider

* Increase test coverage of BTPaymentProvider overrides
* shipping and billing address ABRecordRef memory management
Update CHANGELOG for 3.4.0-rc3
Fix specs for iOS 7 deployment target
Bump pod version to 3.4.0-rc3