Allow set of driver_needs_utf8 option

Allow setting the 'driver_needs_utf8' option on django's settings.
Merge pull request #37 from tax/master

Added working tests! Woot!
Merge pull request #39 from tax/master

Added manfre to readme and fixes introspection tests
Fix runshell without ODBC_DSN in settings.DATABASES['X']
minor README update
Merge pull request #42 from padelt/master

Fix runshell without ODBC_DSN in settings.DATABASES['X']
minor README updates
update formatting for OPTION explanation in README
reference LICENSE file appropriately
update LICENSE
update licensing text
update readme thank-yous
more readme edits
a few more minor README updates
change link to GitHub for pyodbc library
readme update
another readme update
add note about pyodbc
change copy a bit
Fix uninitialized driver_is_freetds variable