[Merge] lp:~michael-sheldon/webbrowser-app/implement-download-folder into lp:webbrowser-app

[Olivier Tilloy]

Thanks for adding the unit tests for DownloadsModel. The current coverage is 63.3%, this is not bad but it could easily be improved. The following methods are not covered by the unit tests:
 DownloadsModel::setPath()
 DownloadsModel::setError()
 DownloadsModel::moveToDownloads()
 DownloadsModel::deleteDownload()
 DownloadsModel::pauseDownload()
 DownloadsModel::resumeDownload()
 DownloadsModel::removeExistingEntryFromDatabase()
 DownloadsModel::canFetchMore()

Also, since this is a list model, please consider monitoring the rowsAdded(), rowsRemoved(), rowsMoved() and dataChanged() signals, and verifying that they are emitted when expected, with the correct parameters.
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https://code.launchpad.net/~michael-sheldon/webbrowser-app/implement-download-folder/+merge/268815
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