Refactor PipelinerService to work with pull requests

[Jakub-Vacek]

Refactor and rename method getPipelines in class PipelinerService to return array of Result objects containing attributes:

• type: Enum - type of data in data attribute, it can have values pipeline or pullRequest
• data: PipelineResult or PullRequestResult - PullRequestResult object contains:
  • id: Int
  • name: String - name of pull request
  • url: String - web url to pull request
  • state: Enum - state of pull request inProgress or merged or closed
  • age: String - age of pull request formated using DateService and createdAt attribute
  • duration: String - duration of pull request formated using DateService and lastActivityAt attribute
  • repositoryName: String - name of pull request repository

Depends on #12, #13 and #14