* referrer tests

* Core system tests

* Log Analytics is compatible with Python 2.7

* Note

* Submodule

* UI tests: Gender neutral

refs #5940 put tests in correct folders, better testsuite names, some tests still fail and I cannot figure out why

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refs #3013 - add <imageGraphEvolutionUrl/> to expected integration test files (note: could not run all integration tests because of 'SKIPPED since it fails around midnight...')

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 * Fixing few bugs found by integration tests and hopefully fixing build!

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 * Metadata output now contains "imageGraphUrl"
 * the function used by piwik mobile and others, API.getReportMetadata now accepts period and date parameters
  * for "Evolution graphs" (goals, visitssummary, etc.) we must "plot" multiple days previous to the currently selected date. 
  The metadata APi automatically does the $date parameter rewrite, when period != range, and date is not already a range.
  Therefore the imageGraphUrl can be used as is.
 * New page available at: index.php?module=ImageGraph&action=index&idSite=1&period=month&date=2011-04-17
  * This page will call metadata APi then display the graph for all existing reports. This is a useful debug/test page to view all graphs as they will be displayed in Piwik Mobile (and PDF reports later refs #2706

Refs #1721
 * Showing less vertical bars in graph by default 
 * Displaying empty graph when there is no data

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 * Do not display Conversion rate from "All columns" view, when there is "per goal" metric available
 * Do not display conversion rate on the "Goals" view
 * Remove nb_visits_converted from the API when there is "per goal" metric
 * Revenue per visit, is now based on the sum of revenue for all goals, rather than trusting the "revenue" field in the visit (in case Goal Revenue was attributed to a Referrer that is different from the visit Referrer where this conversion occurred)

API Breaking: nb_visits_converted not already in response anymore (only when there is no "per goal" metrics for this report)

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 * Adding PDF plugin, based on the submission from jeremy lavaux and Lyzun Oleksandr.
 * I rewrote nearly all code to comply with Piwik coding styles/guidelines/ etc.  and also because it had to use the Metadata which wasn't yet created when the PDF code was initially written
 * Features customizable PDF reports (based on metadata reports), with description + scheduling (daily/weekly/monthly) and send to current user as well as additional emails listed 
 * Added helper function Piwik::getCurrentUserEmail()
 * Refactored window modal popover into a helper method piwikHelper.windowModal (used to ask confirmation when deleting stuff) Refs #1490
 * Refactored the Goals CSS into generic CSS which can be reused and is reused for PDF UI
Refs #1184
 * The callback must pass $this instead of the class name as it 
TODO
 * test scheduled tasks send email properly (email looks good + attachment works)
 * Add comment header in PDFReports files
 * Can we remove some files in TCPDF which adds a lot of space in the release (eg. some fonts in libs/fonts ?)
 * Test PDF with UTF8 characters


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