#435: added Statistic model
#435: added implementation of Statistic methods
#435: clanup migration
#435: added mock of logic
#435: fetch data for BuildLists graph
fix undefined method 'html_safe' for nil:NilClass
add rescue from Yajl::ParseError
add additional check for the undefined method 'html_safe' for nil:NilClass
remove wrong line
fix UrlGenerationError: No route matches
#435: cleanup, refactoring, updated locales
Merge branch 'master' into 435-activity-statistics
#435: changes according to Alexander's comments
#435: cleanup
#435: updated date format
Merge pull request #436 from abf/rosa-build:435-activity-statistics
 #435: Activity statistics
allow publish packages with same release versions for rhel
#435: cleanup
upadted specs
Merge branch 'allow-publish-packages-with-same-release-versions-for-rhel'