Don't count non-standard answer when calculating wait time mode
added tests for analyze and get_mode
some tests for survey utils
merged develop into this
improved tests coverage of surve/utils.py
fix bug in core/utils/extract_attr and improve test coverage overall
removed comments
improved test coverage
fixed flake8 issues
Got it semi looking ok
Added surveys number as an additional line currently.
changed date headers to services/facilities
support hiding generic feedback; exclude all hidden feedback, not only open ended responses
add help_text for GenericFeedback.display_on_dashboard
correct help text for SurveyQuestionResponse and GenericFeedback
Changed CSS for print version and web version of reports to make them look nicer.
Added logo to the top of the pages
Added special logo for header so it didn't push graph down
Got LGA page working nicely with printer splitting the table
Merge pull request #191 from caktus/relabel

changed date headers to services/facilities