promises

• Renames await() to awaitPromise().

• FBLPromiseCatchBlock renamed to FBLPromiseCatchWorkBlock
• Introduced FBLPromiseErrorIsTimedOut() and FBLPromiseErrorIsValidationFailure() for easier check for predefined FBLPromiseErrorCodes

Swift convenience constructor that accepts a work block and eventually resolves the newly created promise with its return value (aka do operator in Objective-C) is now overloaded and can return another promise, not only a value.

Introducing await and delay operators.

Breaking changes:

• any renamed to race
• when renamed to any
• resolve renamed to wrap