Add Hubic backend
Update man page
Add hubic identity module
Update man page
Merge lp:duplicity onto lp:~adrien-delhorme/duplicity/hubic
* In webdavbackend.py:
  - Fixed bug 1396106 with change by Tim Ruffing, mispelled member.
  - Added missing 'self.' before member in error message.
* Merged in lp:~adrien-delhorme/duplicity/hubic
  - Add Hubic support through pyrax and a custom pyrax_identity module.