rename get_my_multis to get_my_multireddits

and reflect in changes.rst
Merge pull request #349 from voussoir/master

rename get_my_multis to get_my_multireddits
 no longer raises exceptions on success.
Resolve many pep257 'Docstring missing' errors.
Enable HTTPS everywhere.
Fix test_scope_read_get_submission_by_url test.
Make 3.0a1 version.
Remove deprecated methods.
Display name is case-sensitive. Closes #236.
Fix authorization URL domain.