Adjust TranslationWriterTest

fixes #4086

now thirdparty translations will be removed

Refs #4087, rewrote UI integration tests to use phantomjs or slimerjs and added (disabled) UI tests to travis build config.

Notes:
  * Modified main page-loading JavaScript to use ajaxHelper so it's possible to know when all AJAX requests are made.
  * Add setUrl method to ajaxHelper so it can be used when a doing AJAX w/ a URL instead of an object containing query parameters.

Refs #4041, added  parameter to Archive::getDataTableExpanded so entire tree will not be created if not necessary.

Refs #4040, #4041, removed ViewDataTable::init & moved default property values for core properties to Properties class.

Refs #4041, #4040 add new CoreVisualizations plugin and move HtmlTable, Cloud & JqplotGraph visualizations to it and improve UIIntegration test debug output.

Refs #4040, #4041, move visualization only view properties to separate visualizations, changed JavaScript properties to 'client side parameters' and 'overridable properties' to 'client side properties', changed keep_summary_row from a JavaScript property to a client side property, allowed visualization properties to be inherited, fixed system that allowed visualizations to set custom defaults for property values, modified behavior of datatable_css_class viewdatatable property, allow view properties to be customized in metadata based on the visualization used, and tweaks to UI Integration tests.

Refs #4040, #4041, move AllColumns ViewDataTable & Goals ViewDataTable logic to HtmlTable visualization class & remove those classes. Revised the way visualizations default/override view properties. Cleaned up the ViewDataTable class a bit. Added base type for datatable visualizations.

Added namespaces to functions.php files in the five plugins that had one
Work in progress

Refs #4040, #4041 removed rest of viewdatatable set/get/enable/disable property functions, did the same for all other ViewDataTable classes, moved most of ViewDataTable/HtmlTable logic to visualization instead of main class and re-add links for UI integration tests.

renaming Unzip to Uncompress,
Renaming Tracker/Referer to Tracker/Referrer,
and few more

Refs #4041, modify tag cloud ViewDataTable to use _dataTable.twig w/ Visualization_Cloud as visualization..

Removed many Piwik_ functions, in Piwik 2 it is best practise to use the methods calls instead

Todo: finish converting core/ classes + convert plugins/ classes to use \Piwik\Plugin namespace + fix build + Merge master

Refs #4059 Work in progress: Conversion to use Namespaces: Period*, Metrics, Segment, SegmentExpression, PluginsManager.
Removed some deprecated code.