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/Cost.php

@@ -4,45 +4,50 @@ namespace PayPal\Api;
 use PayPal\Common\PPModel;
 use PayPal\Rest\ApiContext;
 
-class Cost extends PPModel {
-	/**
-	 * Cost in percent. Range of 0 to 100.
-	 *
-	 * @param PayPal\Api\number $percent
-	 */
-	public function setPercent($percent) {
-		$this->percent = $percent;
-		return $this;
-	}
+class Cost extends PPModel
+{
+    /**
+     * Cost in percent. Range of 0 to 100.
+     *
+     * @param PayPal\Api\number $percent
+     */
+    public function setPercent($percent)
+    {
+        $this->percent = $percent;
+        return $this;
+    }
 
-	/**
-	 * Cost in percent. Range of 0 to 100.
-	 *
-	 * @return PayPal\Api\number
-	 */
-	public function getPercent() {
-		return $this->percent;
-	}
+    /**
+     * Cost in percent. Range of 0 to 100.
+     *
+     * @return PayPal\Api\number
+     */
+    public function getPercent()
+    {
+        return $this->percent;
+    }
 
 
-	/**
-	 * Cost in amount. Range of 0 to 999999.99.
-	 *
-	 * @param PayPal\Api\Currency $amount
-	 */
-	public function setAmount($amount) {
-		$this->amount = $amount;
-		return $this;
-	}
+    /**
+     * Cost in amount. Range of 0 to 999999.99.
+     *
+     * @param PayPal\Api\Currency $amount
+     */
+    public function setAmount($amount)
+    {
+        $this->amount = $amount;
+        return $this;
+    }
 
-	/**
-	 * Cost in amount. Range of 0 to 999999.99.
-	 *
-	 * @return PayPal\Api\Currency
-	 */
-	public function getAmount() {
-		return $this->amount;
-	}
+    /**
+     * Cost in amount. Range of 0 to 999999.99.
+     *
+     * @return PayPal\Api\Currency
+     */
+    public function getAmount()
+    {
+        return $this->amount;
+    }
 
 
 }