Use standard params
  - [X] Retrieve labels from the board
  - [X] Install labels/tags information in global org-trello metadata
  - [X] Show current labels
Remove duplicated function
Format
Use the same org-trello buffer
  - [X] Parse labels among org data
  - [X] Open api to create/update cards with labels
  - [X] Update labels information when synchronizing to trello
Fix missing test case