set device detector version to 1.0, as next release of device detector will break with piwik until some adjustments are made

refs #1915 "columns" is added as a special query parameter in ViewDataTable class which results in having to do this. Problem: Switching to treemap visualization in eg PageUrls will save a columns "nb_hits" param, loading the normal view and sorting by column will result in only displaying nb_hits column instead of all columns. This seems to be the only case. If there are more we need to let the visualization decide which parameters to reset in case of a visualization change

refs #4987 there might be rows with different paddings, for instance in outlinks when opening subtables. Make sure to remove the highest padding values to prevent any jumping effects

refs #4987 the label truncation should ignore the maxLabelWidth if width of datatable is set to 100% which is the case for instance in Actions/Pages

refs #4987 I think this call is not needed. It works for me without the show() call. Fixes when opening the dashboard in ZenMode the dashboard submenu item is displayed although the mouse is somewhere completely else

added possibility to get/create a tracker by using "Tracker = AnalyticsTracker.getTracker" instead of "Piwik.getTracker". Variable will be set only if no such variable is defined yet

Fix tracking actions with empty page titles using MySQL 5.6+.

email_me is integer, fixes: General error: 1366 Incorrect integer value: '' for column 'email_me' at row 1
https://travis-ci.org/piwik/piwik/jobs/25436325

Fix notice: PDOException: SQLSTATE[42000]: Syntax error or access violation: 1101 BLOB/TEXT column 'additional_emails' can't have a default value

Refs https://github.com/piwik/piwik/pull/279

Run Ci builds on Mysql 5.6 to test and prevent (some critical) bugs caused by the now-enabled-by-default STRICT_TRANS_TABLES setting.

To prevent such issues let's run all tests against it. Refs https://github.com/piwik/piwik/pull/279

Reused Mysql 5.6 gist provided in https://github.com/travis-ci/travis-ci/issues/1986

CSS Cleanups, variables refactor Fixes #5175
Kuddos Thomas, it is very useful to refactor the platform stylesheets! Keep it coming :)

Add quote identifier to prevent error: SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corr