Update docs and Readme, fix Code Coverage

Author: Art4

README.md

@@ -68,7 +68,7 @@ JsonApiClient can be used as a validator for JSON API contents:
 ```php
 $wrong_jsonapi = '{"data":{},"meta":{"info":"This is wrong JSON API. `data` has to be `null` or containing at least `type` and `id`."}}';
 
-if ( \Art4\JsonApiClient\Utils\Helper::isValid($wrong_jsonapi) )
+if ( \Art4\JsonApiClient\Utils\Helper::isValidResponseBody($wrong_jsonapi) )
 {
 	echo 'string is valid.';
 }

docs/exception-introduction.md

@@ -23,7 +23,7 @@ $wrong_jsonapi = '{"data":{},"meta":{"info":"This is wrong JSON API. `data` has
 
 try
 {
-	$document = \Art4\JsonApiClient\Utils\Helper::parse($wrong_jsonapi);
+	$document = \Art4\JsonApiClient\Utils\Helper::parseResponseBody($wrong_jsonapi);
 }
 catch (\Art4\JsonApiClient\Exception\ValidationException $e)
 {

docs/objects-document.md

@@ -29,7 +29,7 @@ You can check for all possible values using the `has()` method.
 ```php
 $jsonapi_string = '{"meta":{"info":"Testing the JsonApiClient library."}}';
 
-$document = \Art4\JsonApiClient\Utils\Helper::parse($jsonapi_string);
+$document = \Art4\JsonApiClient\Utils\Helper::parseResponseBody($jsonapi_string);
 
 var_dump($document->has('data'));
 var_dump($document->has('errors'));

docs/objects-introduction.md

@@ -54,7 +54,7 @@ You can check for all possible values using the `has()` method.
 ```php
 $jsonapi_string = '{"meta":{"info":"Testing the JsonApiClient library."}}';
 
-$document = \Art4\JsonApiClient\Utils\Helper::parse($jsonapi_string);
+$document = \Art4\JsonApiClient\Utils\Helper::parseResponseBody($jsonapi_string);
 
 var_dump($document->has('meta'));
 ```

docs/utils-helper.md

@@ -12,7 +12,7 @@ Assuming you have get a response from a JSON API server. Use `parse()` to work w
 // The Response body from a JSON API server
 $jsonapi_string = '{"meta":{"info":"Testing the JsonApiClient library."}}';
 
-$document = \Art4\JsonApiClient\Utils\Helper::parse($jsonapi_string);
+$document = \Art4\JsonApiClient\Utils\Helper::parseResponseBody($jsonapi_string);
 ```
 
 This returns a [Document](objects-document.md) object which provided all contents.
@@ -46,7 +46,7 @@ JsonApiClient can be used as a validator:
 ```php
 $wrong_jsonapi = '{"data":{},"meta":{"info":"This is wrong JSON API. `data` has to be `null` or containing at least `type` and `id`."}}';
 
-if ( \Art4\JsonApiClient\Utils\Helper::isValid($wrong_jsonapi) )
+if ( \Art4\JsonApiClient\Utils\Helper::isValidResponseBody($wrong_jsonapi) )
 {
 	echo 'string is valid.';
 }

tests/Unit/Utils/HelperTest.php

@@ -161,7 +161,7 @@ public function testParseWithValidJsonapiReturnsDocument()
 	{
 		$jsonapi = '{"meta":{}}';
 
-		$this->assertInstanceOf('Art4\JsonApiClient\Document', Helper::parseResponseBody($jsonapi));
+		$this->assertInstanceOf('Art4\JsonApiClient\Document', Helper::parse($jsonapi));
 	}
 
 	/**
@@ -173,7 +173,7 @@ public function testParseWithInvalidJsonapiThrowsException()
 	{
 		$invalid_jsonapi = '["This is valid JSON", "but invalid JSON API"]';
 
-		$output = Helper::parseResponseBody($invalid_jsonapi);
+		$output = Helper::parse($invalid_jsonapi);
 	}
 
 	/**
@@ -185,7 +185,7 @@ public function testParseWithInvalidJsonThrowsException()
 	{
 		$invalid_json = 'invalid_json_string';
 
-		$output = Helper::parseResponseBody($invalid_json);
+		$output = Helper::parse($invalid_json);
 	}
 
 	/**