remove state provider code

[lukasheinrich]

• remove state provider .. this the responsibility of workflow engines, not packtivity itself as it relates to orchestrating / genearting multiple states of multiple packtivities

[coveralls]

Coverage increased (+3.7%) to 75.118% when pulling 70d4502 on removeProvider into 7ad7b4d on master.

[coveralls]

Coverage increased (+3.1%) to 74.572% when pulling 1a9e82b on removeProvider into 7ad7b4d on master.

[coveralls]

Coverage increased (+3.1%) to 74.601% when pulling 67a893d on removeProvider into 7ad7b4d on master.