Refactor workflow and workflow action id from int to long

[gmokki]

No description provided.

[coveralls]

Coverage remained the same at 67.742% when pulling 2a7a185 on long_ids into 3e5485c on master.

[coveralls]

Coverage remained the same at 67.742% when pulling 2a7a185 on long_ids into 3e5485c on master.

[coveralls]

Coverage remained the same at 67.742% when pulling 2a7a185 on long_ids into 3e5485c on master.

[coveralls]

Coverage remained the same at 67.742% when pulling 5256f72 on long_ids into 3e5485c on master.

[efonsell]

Added some minor comments. In general, if we would use long constants instead of magic numbers in tests we would not need to put those Ls everywhere...