Added LICENSE_HEADER.txt file to be used in all file headers.

Signed-off-by: Daniel San <daniel.sam123@hotmail.com>
Code refactory

    - Removed unused class (HtmlParser and Information).
    - Changed the location of some class (Util and DownloadHtml).
    - Update methods of the Util class.

Signed-off-by: Daniel San <daniel.sam123@hotmail.com>
Removed more unused class (HandlerConnect).

Signed-off-by: Daniel San <daniel.sam123@hotmail.com>
More core refactory

    - Create new class Package.
    - New class Package now use new class Checkpoint.
    - New class's now are create on new path.
    - Create new interface to update a Package (ShippingCarrierProvider).
    - Create new class that implements interface ShippingCarrierProvider
      to update Package from Brazil's post office.

Signed-off-by: Daniel San <daniel.sam123@hotmail.com>
Updated necessary files

    - Update .pro file to build new project configuration.
    - Update main.cpp to show example of use of the new
      configuration of the api.

Signed-off-by: Daniel San <daniel.sam123@hotmail.com>