add kebab and snake case support in CloudinaryContext and tests

src/components/CloudinaryContext/CloudinaryContext.js

@@ -1,5 +1,6 @@
 import React from 'react';
 import CloudinaryComponent from '../CloudinaryComponent';
+import { Util } from 'cloudinary-core';
 
 /**
  * Provides a container for Cloudinary components. Any option set in CloudinaryContext will be passed to the children.
@@ -19,9 +20,11 @@ class CloudinaryContext extends CloudinaryComponent {
 
   getChildContext() {
     let context = {};
+    const camelProps = Util.withCamelCaseKeys(this.props);
+
     // only pass valid Cloudinary options
     CloudinaryComponent.VALID_OPTIONS.forEach(key => {
-      let val = this.props[key] || this.context[key];
+      let val = camelProps[key] || this.context[key];
       if (val !== undefined && val !== null) {
         context[key] = val;
       }

test/ContextTest.js

@@ -20,6 +20,28 @@ describe('CloudinaryContext', () => {
     expect(img.instance().state.url).to.equal("http://res.cloudinary.com/demo/image/upload/sample");
   });
 
+  it("should pass properties to children with snake case", function() {
+      let tag = mount(
+          <CloudinaryContext className="root" cloudName="demo" fetch_format="auto" >
+              <Image publicId="sample" />
+          </CloudinaryContext>
+      );
+
+      let img = tag.find("div").childAt(0);
+      expect(img.instance().state.url).to.equal("http://res.cloudinary.com/demo/image/upload/f_auto/sample");
+  });
+
+  it("should pass properties to children with kebab case", function() {
+      let tag = mount(
+          <CloudinaryContext className="root" cloudName="demo" fetch-format="auto" >
+              <Image publicId="sample" />
+          </CloudinaryContext>
+      );
+
+      let img = tag.find("div").childAt(0);
+      expect(img.instance().state.url).to.equal("http://res.cloudinary.com/demo/image/upload/f_auto/sample");
+  });
+
   it("should remove Cloudinary custom properties from CloudinaryContext component", function() {
     let html = mount(
       <CloudinaryContext