fix #3753 - fix UserAgent detection for UIWebView
fix #3298 - add unit test for Firefox Mobile (replacing Fennec)
FIxes #3761 Regenerate cache file on first cache miss
Merge remote-tracking branch 'origin/master'
Fixing Smarty PHP 5.5 error on travis https://travis-ci.org/piwik/piwik/jobs/4848438
Fixes #2830 Implementing Tracker Cache TTL (in config file, [Tracker]
Refs #2830 More fixes forgot in previous commit
Disabling test for 5.4 as PDF has a few bytes difference
Missing include
Merge branch 'master' of github.com:sgiehl/piwik
Merge branch 'master' into translationupdates