Merge branch '37-attributeerror-anonymoususer-object-has-no-attribute-bbb_get_attendee' into 'master'

Resolve "AttributeError: 'AnonymousUser' object has no attribute 'bbb_get_attendee'"

Closes #37

See merge request infrablue/python-bigbluebutton2!29

Fix typo

See merge request infrablue/python-bigbluebutton2!30

Default role.VIEWER instead of MODERATOR

See merge request infrablue/python-bigbluebutton2!26

Fix typo

See merge request infrablue/python-bigbluebutton2!27

Replace description with the correct attribute help_text

See merge request infrablue/python-bigbluebutton2!25

Fix typo

See merge request infrablue/python-bigbluebutton2!24

Import RegexValidator

See merge request infrablue/python-bigbluebutton2!23

Otherwise, all generated labels would be namespaced as django_.

Update dependency inflection to ^0.5.0

See merge request infrablue/python-bigbluebutton2!21

Update dependency sphinx_rtd_theme to ^0.5.0

See merge request infrablue/python-bigbluebutton2!22

Resolve "Too much brackets in models.py"

Closes #33

See merge request infrablue/python-bigbluebutton2!20

Closes #30.

Resolve "Persistent caching of meeting data"

Closes #25

See merge request infrablue/python-bigbluebutton2!16

This adds a private module _caching that wraps both the Django caching frameworks and the ucache
libray. Both happen to expose the same (or at least sufficiently identical) API. If neither is
usable, a dummy cache class mocking the API, but doing nothing, is instantiated.