Solve #48 - Dynamic WIP limit value

[FelipeGuzmanSierra]

Closes #48

Description

In this PR the hard-coded wip limits were removed and a new format configuration was added to the wip limits use case. The new configuration is call limits, and it should be a map where the domain limits are defined. For example:

{
  "ops": 3,
  "marketing": 5,
  "engineering": 8
}