* 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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 * Ensuring consistency in returned data (zero values are 0% or € 0). Also consistency in rounding.
 * Adding test string returned API.getReport() date + metadata for visit with goal conversion
 * Also adding logo.tpl in the release + helper method to access it (will be used to display in logo in PDF for example. Could later be customizable per-site or globally eg.)

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 * Adding a magic method to request a given report but with all the metadata returned (report name, column list, translations, etc.) as well as the data, already filtered, ready to be displayed. I think this could be incredibly useful to Mobile Piwik Client!! Check out: getProcessedReport($idSite, $date, $period, $apiModule, $apiAction, $apiParameters = false)
 * This is used in the future PDF export plugin refs #71 
 * Minor updates to UI text

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Refs #71

Note: I haven't tested SMTP myself. will require beta tests 

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