Merge branch 'release/0.2.5' into develop
Allow our caller to pass in an already created session object.
Be less odd.
Autocommit after certain method calls, but only when configured to do so.
Make get person/badge and badge/person exists methods case-insensitive.
Make get_assertions_by_badge case-insensitive.
PEP 8.
Add method to get invitations by issuer ID.
Invitations have persons as issuers, not Issuers.
0.2.6
Merge branch 'release/0.2.6'