Prevent negative slide number (#249)

Author: mrbinky3000

src/CarouselProvider/CarouselProvider.jsx

@@ -140,7 +140,7 @@ const CarouselProvider = class CarouselProvider extends React.Component {
     }
 
     if (this.carouselStore.state.currentSlide >= this.props.totalSlides) {
-      newStoreState.currentSlide = this.props.totalSlides - 1;
+      newStoreState.currentSlide = Math.max(this.props.totalSlides - 1, 0);
     }
 
     if (Object.keys(newStoreState).length > 0) {

src/CarouselProvider/__tests__/CarouselProvider.test.jsx

@@ -73,7 +73,7 @@ describe('<CarouselProvider />', () => {
     expect(start.currentSlide).toEqual(end.currentSlide);
     expect(start.disableAnimation).toEqual(end.disableAnimation);
   });
-  it('should set disableAnimation to true and privatUnDisableAnimation to true if we updated currentSlide prop on CarouselProvider component', async () => {
+  it('should set disableAnimation to true and privateUnDisableAnimation to true if we updated currentSlide prop on CarouselProvider component', async () => {
     const wrapper = mount(
       <CarouselProvider {...props}>Hello</CarouselProvider>,
     );
@@ -83,7 +83,7 @@ describe('<CarouselProvider />', () => {
       true,
     );
   });
-  it('The Slider component should reset disableAnimation to false and privatUnDisableAnimation to false if when Slider component is updated', async () => {
+  it('The Slider component should reset disableAnimation to false and privateUnDisableAnimation to false if when Slider component is updated', async () => {
     const wrapper = mount(
       <CarouselProvider {...props}>
         <Slider>Hello</Slider>
@@ -103,7 +103,7 @@ describe('<CarouselProvider />', () => {
     );
     expect(wrapper.instance().getStore().state.isIntrinsicHeight).toBe(true);
   });
-  it('should throw an error, when tryng to use isIntrinsicHeight in vertical orientation', async () => {
+  it('should throw an error, when trying to use isIntrinsicHeight in vertical orientation', async () => {
     expect(() => shallow(
       <CarouselProvider {...props} isIntrinsicHeight orientation="vertical">
         test