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Merge branch 'develop'
Bump version to 0.5.3.
Replace Gtk.Table with Gtk.Grid.
Replace deprecated GtkStyle with GtkStyleContext.
Add tooltips to new task dialog.
Use right aligned labels in new task dialog.
Added title for toplevel window.
Put database related code to a separate file.
Added debian directory for deb files building.
Start the aria2c daemon on yaner start up.
Use python-distutils-extra to simplify setup.py.
Bumped version to 0.5.2.
Removed the preferences toolbutton.
Renamed _TaskOption to _Option.
Added Settings class for Gio.Settings.
Added close button and response callback, WIP.
Added preferences dialog, WIP.
Moved init parameters of the new task dialog to the toplevel window.
Splited InfoBars to a separated file.
Fixed the bug that only SpinButton value is saved to GSettings.
Added proxy support.
Added a Miscellaneous page for the new task dialog.
Double click to open local file with xdg-open.
Hide save expander in default UI.
Bumped version to 0.5.1.
Fixed the unexpected behavior when adding two tasks from the browser.
Press delete key to delete tasks.
Double click the task row to start/pause the task.