Refactor/folders

[XDevos]

When we initiate a Feature, the output structure will be created. So, Folders class and folder.py are removed.

pyHiM v0.8.8 provide:

• tests for each option of:
  • register_local
  • mask_2d
  • localize_2d
  • localize_3d
  • (mask_3d is tested inside test_pyhim.py)
• A Feature sub-class for each routine
• A code without deprecated files