Changed rest uri constants for jersay http call

Change-Id: Id72afca33918d249bd2dad55235bca618b18b85d
Signed-off-by: Simon Scholz <simon.scholz@vogella.com>
Added Jacksons ObjectMapper to generate Todos from json

Change-Id: I1f10d04470dcfea0fa8baf7103958546b87aef84
Signed-off-by: Simon Scholz <simon.scholz@vogella.com>