Move Rx Nimble extensions into a new library

They're reusable and should be put in their own pod, something like Nimble+Rx.

https://github.com/artsy/eidolon/blob/cb31168fa29dcc7815fd4a2e30e7c000bd1820ce/KioskTests/TestHelpers.swift#L108-L176


	// TODO: Move these into a separate pod?
	// This is handy so we can write expect(o) == 1 instead of expect(o.value) == 1 or whatever.
	public func equalFirst<T: Equatable>(expectedValue: T?) -> MatcherFunc<Observable<T>> {
	return MatcherFunc { actualExpression, failureMessage in

	failureMessage.postfixMessage = "equal <\(expectedValue)>"
	let actualValue = try actualExpression.evaluate()?.toBlocking().first()

	let matches = actualValue == expectedValue
	return matches
	}
	}

	public func equalFirst<T: Equatable>(expectedValue: T?) -> MatcherFunc<Variable<T>> {
	return MatcherFunc { actualExpression, failureMessage in

	failureMessage.postfixMessage = "equal <\(expectedValue)>"
	let actualValue = try actualExpression.evaluate()?.value

	let matches = actualValue == expectedValue && expectedValue != nil
	return matches
	}
	}

	public func equalFirst<T: Equatable>(expectedValue: T?) -> MatcherFunc<Observable<Optional<T>>> {
	return MatcherFunc { actualExpression, failureMessage in

	failureMessage.postfixMessage = "equal <\(expectedValue)>"
	let actualValue = try actualExpression.evaluate()?.toBlocking().first()

	switch actualValue {
	case .None:
	return expectedValue == nil
	case .Some(let wrapped):
	return wrapped == expectedValue
	}
	}
	}

	public func equalFirst<T: Equatable>(expectedValue: T?) -> MatcherFunc<Variable<Optional<T>>> {
	return MatcherFunc { actualExpression, failureMessage in

	failureMessage.postfixMessage = "equal <\(expectedValue)>"
	let actualValue = try actualExpression.evaluate()?.value

	switch actualValue {
	case .None:
	return expectedValue == nil
	case .Some(let wrapped):
	return wrapped == expectedValue
	}
	}
	}

	public func ==<T: Equatable>(lhs: Expectation<Observable<T>>, rhs: T?) {
	lhs.to(equalFirst(rhs))
	}

	public func ==<T: Equatable>(lhs: Expectation<Variable<T>>, rhs: T?) {
	lhs.to(equalFirst(rhs))
	}

	public func ==<T: Equatable>(lhs: Expectation<Observable<Optional<T>>>, rhs: T?) {
	lhs.to(equalFirst(rhs))
	}

	public func ==<T: Equatable>(lhs: Expectation<Variable<Optional<T>>>, rhs: T?) {
	lhs.to(equalFirst(rhs))
	}

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Move Rx Nimble extensions into a new library #570

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Move Rx Nimble extensions into a new library #570

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