Add serializer support into tasks interface
Fix drop property serializer_class
property serializer_class revert
 Naive implementation of get-set method. One place for definition of task names
Missed GETSET in TASK_NAMES
Add check serializer class, fix property
GETSET became an atomic operation
Add test for serializer_cls
Copy task names from utils into Client class
Fix tests, add meta inheritance
Merge pull request #5 from dtrst/master

Add serializer_cls
Up to 0.5
Configuration Travis CI & test runner