Add scan response support for central role

Feature added:
1. GIT#370 Add scan response support for central role
    Arduino request that the BLE library, in Peripheral mode,
    to support Scan Response Data request from a Central.
2. Arduino expects the reply similar to an Apple device.
    They have provide a policy for the construction of the
    Scan Response data message.
3. Jira 836 BLE Central scan does not enumerate peripherals that are
    non connectable.
    In Central mode, the BLE library should enumerate Peripheral
    that are non-connectable (eg beacon).

Code mods:

BLEDevice.cpp:
1. Add the call to get Manufacturer Data info from a Peripheral.
    Non-connectable device may only broadcast this info.

BLEDeviceManager.cpp:
1. Added setAdvertiseData() for the creation of the Scan Response Data message.
2. In advDataInit(), follows the policy (defined by Arduino) to add Adv data to
    the Scan Response Data message using setAdvertiseData().
3. Delete the filter about non-connectable advertisement.
4. Added APIs, hasManufacturerData(), setManufacturerData(),
    hasManufacturerData(), to gain access to adv info of
    non-connectable Peripherals.

BLEDeviceManager.h:
BLEDevice.h:
Prototyping.

Author: sgbihu

libraries/CurieBLE/src/BLEDevice.cpp

@@ -133,6 +133,17 @@ void BLEDevice::setManufacturerData(const unsigned char manufacturerData[],
     BLEDeviceManager::instance()->setManufacturerData(manufacturerData, manufacturerDataLength);
 }
 
+bool BLEDevice::getManufacturerData (unsigned char* manu_data, 
+                                     unsigned char& manu_data_len) const
+{
+    return BLEDeviceManager::instance()->getManufacturerData(this, manu_data, manu_data_len);
+}
+
+bool BLEDevice::hasManufacturerData() const
+{
+    return BLEDeviceManager::instance()->hasManufacturerData(this);
+}
+
 void BLEDevice::setLocalName(const char *localName)
 {
     BLEDeviceManager::instance()->setLocalName(localName);

libraries/CurieBLE/src/BLEDevice.h

@@ -191,6 +191,11 @@ class BLEDevice
     void setManufacturerData(const unsigned char manufacturerData[], 
                              unsigned char manufacturerDataLength);
 
+    bool getManufacturerData (unsigned char* manu_data, 
+                              unsigned char& manu_data_len) const;
+    
+    bool hasManufacturerData() const;
+    
     /**
      * Set the local name that the BLE Peripheral Device advertises
      *