Add support for "signature" param

Author: nirmaoz

package.json

@@ -52,7 +52,7 @@
     "webpack-cli": "^3.1.2"
   },
   "dependencies": {
-    "cloudinary-core": "^2.7.4",
+    "cloudinary-core": "^2.8.2",
     "prop-types": "^15.6.2"
   },
   "peerDependencies": {

test/ImageTest.js

@@ -137,8 +137,8 @@ describe('Image', () => {
     let tag = mount(
       <Image
         innerRef={myRef}
-        cloudName='demo'
-        publicId='sample'
+        cloudName="demo"
+        publicId="sample"
       />
     );
 
@@ -147,4 +147,17 @@ describe('Image', () => {
     expect(tag.find('img').prop('src')).to.equal(expected);
     expect(image.src).to.equal(expected);
   });
+  it('Should support signature param', function () {
+    const expected = 'http://res.cloudinary.com/demo/image/upload/s--signature--/sample';
+
+    let tag = mount(
+      <Image
+        cloudName="demo"
+        publicId="sample"
+        signature="signature"
+      />
+    );
+
+    expect(tag.find('img').prop('src')).to.equal(expected);
+  });
 });