Fixed some static analysis issues

library/src/main/java/uk/co/alt236/bluetoothlelib/device/adrecord/AdRecord.java

@@ -12,7 +12,6 @@ import android.os.Parcelable;
  * Expanded by Alexandros Schillings
  */
 public final class AdRecord implements Parcelable{
-
 	//	02 # Number of bytes that follow in first AD structure
 	//	01 # Flags AD type
 	//	1A # Flags value 0x1A = 000011010

library/src/main/java/uk/co/alt236/bluetoothlelib/device/mfdata/IBeaconManufacturerData.java

@@ -126,7 +126,7 @@ public final class IBeaconManufacturerData {
 	}
 
 	private static String calculateUUIDString(final byte[] uuid){
-		final StringBuffer sb = new StringBuffer();
+		final StringBuilder sb = new StringBuilder();
 
 		for(int i = 0 ; i< uuid.length; i++){
 			if(i == 4){sb.append('-');}

library/src/main/java/uk/co/alt236/bluetoothlelib/util/AdRecordUtils.java

@@ -14,7 +14,7 @@ import android.util.SparseArray;
 public class AdRecordUtils {
 
 	public static String getRecordDataAsString(final AdRecord nameRecord) {
-		if(nameRecord == null){return new String();}
+		if(nameRecord == null){return "";}
 		return new String(nameRecord.getData());
 	}
 

library/src/main/java/uk/co/alt236/bluetoothlelib/util/ByteUtils.java

@@ -16,7 +16,7 @@ public class ByteUtils {
 	 * @return the string
 	 */
 	public static String byteArrayToHexString(final byte[] array){
-		final StringBuffer sb = new StringBuffer();
+		final StringBuilder sb = new StringBuilder();
 		boolean firstEntry = true;
 		sb.append('[');
 

library/src/main/java/uk/co/alt236/bluetoothlelib/util/IBeaconUtils.java

@@ -65,7 +65,7 @@ public class IBeaconUtils {
 	 * Ascertains whether a Manufacturer Data byte array belongs to an iBeacon;
 	 *
 	 * @param manufacturerData a Bluetooth LE device's raw manufacturerData.
-	 * @return
+	 * @return true if the manufacturer data belong to an iBeacon
 	 */
 	public static boolean isThisAnIBeacon(final byte[] manufacturerData){
 		if(manufacturerData == null){return false;}