removed dead code
refs #5192 forgot the since annotation
Merge pull request #5871 from craue/remove-dead-code-per-pr5835

remove dead code
refs #5416 we need to execute 3 queries in order to get the correct number of actions and conversions in last X minutes
refs #5416 maybe this fixes the pluginTests on travis?
refs #5416 do not use local tracking, this should fix the tests. unfortunately we need to extend integrationTestcase instead of databaseTestcase then...
refs #5867 make sure a *.international email address would work
refs #5867 allow up to 15 characters in top level domain
refs #5416 should fix some integration tests
refs #5381 added a contributing.md
fixes #5385 show footer icons by default in those ecommerce reports
refs #5406 prevent error if user is anonymous
refs #5864 make doc generation work again because: Cannot use Piwik\Plugins\Provider\Provider as Provider because the name is already in use
removed some outdated scripts that do no longer work anyway. use console and visitorgenerator plugin instead
fixes #5867 remove upper limit completely
\ZipArchive vs. \ZIPARCHIVE
as vs. AS in foreach loops
simplified a use statement
removed lots of trailing whitespace
reduced multiple empty lines to exactly one