Refs #3456, fixing build.
Refs #3252 Update Thunderbird icon and name
fixes #3252 Update Thunderbird icon and name
Add some more tests for Thunderbird recognition.
Reformatted code a bit.

refs #3252
Latest update on Travis-CI changed the way /etc/hosts looks and made
the test for core/IP.php fail. (getHostByAddress always returns the
first alias from /etc/hosts).
Fixes Integration test after changes to display Continent+Country Code

refs #1652
Refs #3456, fixing build.
 this should help the build refs #3456
Adding directory as it's missing
Get rid of the noisy join/leaves of the travis bot
[ci skip]
Fixes PHP 5.5 build.

Behaviour of pack/unpack changed in PHP 5.5 and caused Archive_Tar to break.

See: http://php.net/manual/en/migration55.changed-functions.php
and http://pear.php.net/bugs/bug.php?id=19746
Limit bot spam in IRC a bit
[ci skip]
FIxes #3761 Regenerate cache file on first cache miss
fix #3753 - fix UserAgent detection for UIWebView
fix #3298 - add unit test for Firefox Mobile (replacing Fennec)
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