xhprof removed their composer.json file, adding it to our composer.json file so we can still use composer to manage xhprof. Added an extra script to make sure the update is clean for git users.
Skip xhprof building if phpize or make are missing.
Trimming output of build-xhprof.sh script.
Merge pull request #6107 from piwik/xhprof_composer

xhprof removed their composer.json file, adding it to our composer.json file so we can still use composer to manage xhprof. Includes output cleanup for build-xhprof.sh script.
refs #6089 should fix broken test after we changed default value
refs #6102 wondering if this solution breaks anything. Should display all processedMetrics in columns array of processed report
refs #6102 make sure processedMetrics is an array to prevent any notice
Merge pull request #6112 from piwik/6102_fixProcessedReportColumns

Fix getProcessedReport does not include all metrics in columns
Merge branch 'master' into 4996_content_tracking