Added fileAbsolutePath()
Fixed a mistake in setting url
Shoudl not append directly to savePath
Doesn't need a Download pointer, just url

Also instead of initializing in Class constructure it's better to do
initialization in initTestClass, I'm pretty sure that's the place for
the job
Added testDownloadPreUuid()
Write test for adding new download
Test for add new download with pre Uuid
Test download uuid
Tested download's name
Tested download's path
Tested Download's URL
Initialed 4 new Tests, But they will fail for now ;)