readURL() {

		const currentIndices = this.Reveal.getIndices();
		const newIndices = this.getIndicesFromHash();

		if( newIndices ) {
			if( ( newIndices.h !== currentIndices.h || newIndices.v !== currentIndices.v || newIndices.f !== undefined ) ) {
					this.Reveal.slide( newIndices.h, newIndices.v, newIndices.f );
			}
		}
		// If no new indices are available, we're trying to navigate to
		// a slide hash that does not exist
		else {
			this.Reveal.slide( currentIndices.h || 0, currentIndices.v || 0 );
		}

	}
Reads the current URL (hash) and navigates accordingly.