Keep track of your API in your code. This also allows you to easily identify places in your application where legacy blocks ('hacks') can be removed.

API.java

public enum API {

	@Deprecated Version1,

	Version2(
		add(Feature.BLUE_ICONS)
	),

	Version3(
		parent(Version2),
		add(Feature.ACTIVITY_FEED)
	),

	Version4(
		parent(Version3),
		remove(Feature.BLUE_ICONS)
	)

	;

	private final Set<Feature> featureSet = new HashSet<Feature>();

	API(FeatureWrapper...features) {
		
		// parents first
		for (FeatureWrapper wrapped : features) {
			if (wrapped.operation == FeatureWrapper.Operation.PARENT) {
				featureSet.addAll(wrapped.parent.featureSet);
			}
		}

		// then modifications
		for (FeatureWrapper wrapped : features) {
			if (wrapped.operation == FeatureWrapper.Operation.ADD) {
				featureSet.add(wrapped.feature);
			} else if (wrapped.operation == FeatureWrapper.Operation.REMOVE) {
				featureSet.remove(wrapped.feature);
			}
		}
	}

	boolean isGreaterThan(API other) {
		return this.ordinal() > other.ordinal();
	}

	boolean isGreaterOrEqualTo(API other) {
		return this.ordinal() >= other.ordinal();
	}

	boolean isLesserThan(API other) {
		return this.ordinal() < other.ordinal();
	}

	boolean isLesserOrEqualTo(API other) {
		return this.ordinal() <= other.ordinal();
	}

	boolean hasFeature(Feature feature) {
		return featureSet.contains(feature);
	}

	boolean hasFeatures(Feature...features) {
		for (Feature feature : features) {
			if (!hasFeature(feature)) {
				return false;
			}
		}

		return true;
	}

	// ---------------------------------------------------------------- //

	private static FeatureWrapper add(Feature feature) {
		return new FeatureWrapper(feature, FeatureWrapper.Operation.ADD);
	}

	private static FeatureWrapper remove(Feature feature) {
		return new FeatureWrapper(feature, FeatureWrapper.Operation.REMOVE);
	}

	private static FeatureWrapper parent(API parent) {
		return new FeatureWrapper(parent);
	}

	private static class FeatureWrapper {
		final Feature feature;
		final Operation operation;
		final API parent;

		private FeatureWrapper(Feature feature, Operation operation) {
			this.feature = feature;
			this.operation = operation;
			this.parent = null;
		}

		private FeatureWrapper(API parent) {
			this.feature = null;
			this.operation = Operation.PARENT;
			this.parent = parent;
		}

		enum Operation {
			ADD, REMOVE, PARENT
		}
	}
}

Feature.java

public enum Feature {
	BLUE_ICONS,
	ACTIVITY_FEED
}