generate uuid and separate server url
add piwik helper
direct call
call piwik in bg
Merge redmine-review-feature-168-record-grs-usage-into-piwik
reflect changes
report better information
Merge redmine-review-feature-170-create-custom-ua-for-piwik
reflect changes
Add version in Changes
Update version file
Merge redmine-release-v0.67
Merge redmine-release-v0.67