Merge pull request #191 from piwik/translationupdates

[automatic translation update] Updated 63 strings in 4 languages (de, el, it, ru)
Fixes #4516 Ignore visits by pingdom bot
Merge remote-tracking branch 'origin/master'
deleted the height to fix support piwik subscribe button
subscribe button was covering smily face; height reoved to fix
updated submodule
Merge pull request #192 from MeganLiang/master

deleted the height to fix support piwik subscribe button
fix some tests because Treemap plugin was not there
relax version constraint for lessphp to allow newer releases
fix PHP version in README.md
Merge pull request #194 from craue/fix-readme-php-version

fix PHP version in README.md 
Thanks for the PR doc fix!
Merge pull request #195 from craue/relax-lessphp-version

relax version constraint for lessphp to allow newer releases
refs #1486 updated submodule where we now store the reportUniqueId instead of module.action to support all reports (goals etc)
Merge remote-tracking branch 'upstream/master'
Added a smart banner linking to the app store
fixed typo in referrer
Fixed html error in Installation, System Check page.
Removed HTML in Installation_SystemCheckPhpPdoAndMysqliSite
and renamed to Installation_SystemCheckPhpPdoAndMysqli
Added a smart banner linking to the app store
move line below
Merge pull request #196 from Uma5/master

Added a smart banner linking to the app store #3433
Thanks for the pull request!