Rename `String.prototype.contains` to `String.prototype.includes`

docs/coverage.html

@@ -193,7 +193,7 @@
         <td></td>
     </tr>
     <tr>
-        <td>String.prototype.contains</td>
+        <td>String.prototype.includes</td>
         <td>None</td>
         <td></td>
     </tr>

test/built-ins/String/prototype/includes/String.prototype.includes_FailBadLocation.js

@@ -13,7 +13,7 @@ includes: [runTestCase.js]
 ---*/
 
 function testcase() {
-  if('word'.contains('w', 5) === false) {
+  if('word'.includes('w', 5) === false) {
   	return true;
   }
  }

test/built-ins/String/prototype/includes/String.prototype.includes_FailLocation.js

@@ -13,7 +13,7 @@ includes: [runTestCase.js]
 ---*/
 
 function testcase() {
-  if('word'.contains('o', 3) === false) {
+  if('word'.includes('o', 3) === false) {
   	return true;
   }
  }

test/built-ins/String/prototype/includes/String.prototype.includes_FailMissingLetter.js

@@ -11,7 +11,7 @@ includes: [runTestCase.js]
 ---*/
 
 function testcase() {
-  if('word'.contains('a', 0) === false) {
+  if('word'.includes('a', 0) === false) {
   	return true;
   }
  }

test/built-ins/String/prototype/includes/String.prototype.includes_Success.js

@@ -13,7 +13,7 @@ includes: [runTestCase.js]
 ---*/
 
 function testcase() {
-  if('word'.contains('w', 0) === true) {
+  if('word'.includes('w', 0) === true) {
   	return true;
   }
  }

test/built-ins/String/prototype/includes/String.prototype.includes_SuccessNoLocation.js

@@ -13,7 +13,7 @@ includes: [runTestCase.js]
 ---*/
 
 function testcase() {
-  if('word'.contains('w') === true) {
+  if('word'.includes('w') === true) {
   	return true;
   }
  }

test/built-ins/String/prototype/includes/String.prototype.includes_lengthProp.js

@@ -11,7 +11,7 @@ includes: [runTestCase.js]
 ---*/
 
 function testcase() {
-  if('word'.contains.length === 1) {
+  if('word'.includes.length === 1) {
   	return true;
   }
  }