Allow set of driver_needs_utf8 option

Allow setting the 'driver_needs_utf8' option on django's settings.
Rolled back unintended change on version
Merge branch 'master' of github.com:martingalloar/django-pyodbc into martingalloar-master

* 'master' of github.com:martingalloar/django-pyodbc:
  Rolled back unintended change on version
  Allow set of driver_needs_utf8 option
Merge branch 'martingalloar-master'

* martingalloar-master:
  Rolled back unintended change on version
  Allow set of driver_needs_utf8 option