Added endpoint for retrieving grades data
Fixed device inventory bug due to mysql migration
(cherry picked from commit 2fee0e5)
Questionaire columns are now quote enclosed when exporting to csv
(cherry picked from commit a0df1f9)
Added timezone info to prize entries in the database
(cherry picked from commit 1f855d7)
Fixed error message for cases in which the requested data quality hasn't yet been calculated for the specified period
(cherry picked from commit 29e1a26)
Added time localization to quality prize computation
(cherry picked from commit 2b3a1aa)
Changed version
Merge branch 'release-0.2.9'

Conflicts:
	CHANGELOG
	VERSION