Removing Dependency from SDK Core Project

- Copied files required for Rest API SDK
- Removed PPApiContext and directly connected APIContext with PPConfigManager
- Removed duplicate data storage of configuration and credentials.
- Code Style Fixes
- Remove build.xml file as it is not required anymore
- Updated the samples
- Updated the documentations

lib/PayPal/Api/CustomAmount.php

@@ -4,45 +4,50 @@ namespace PayPal\Api;
 use PayPal\Common\PPModel;
 use PayPal\Rest\ApiContext;
 
-class CustomAmount extends PPModel {
-	/**
-	 * Custom amount label. 25 characters max.
-	 *
-	 * @param string $label
-	 */
-	public function setLabel($label) {
-		$this->label = $label;
-		return $this;
-	}
+class CustomAmount extends PPModel
+{
+    /**
+     * Custom amount label. 25 characters max.
+     *
+     * @param string $label
+     */
+    public function setLabel($label)
+    {
+        $this->label = $label;
+        return $this;
+    }
 
-	/**
-	 * Custom amount label. 25 characters max.
-	 *
-	 * @return string
-	 */
-	public function getLabel() {
-		return $this->label;
-	}
+    /**
+     * Custom amount label. 25 characters max.
+     *
+     * @return string
+     */
+    public function getLabel()
+    {
+        return $this->label;
+    }
 
 
-	/**
-	 * Custom amount value. Range of 0 to 999999.99.
-	 *
-	 * @param PayPal\Api\Currency $amount
-	 */
-	public function setAmount($amount) {
-		$this->amount = $amount;
-		return $this;
-	}
+    /**
+     * Custom amount value. Range of 0 to 999999.99.
+     *
+     * @param PayPal\Api\Currency $amount
+     */
+    public function setAmount($amount)
+    {
+        $this->amount = $amount;
+        return $this;
+    }
 
-	/**
-	 * Custom amount value. Range of 0 to 999999.99.
-	 *
-	 * @return PayPal\Api\Currency
-	 */
-	public function getAmount() {
-		return $this->amount;
-	}
+    /**
+     * Custom amount value. Range of 0 to 999999.99.
+     *
+     * @return PayPal\Api\Currency
+     */
+    public function getAmount()
+    {
+        return $this->amount;
+    }
 
 
 }