New features:
* Support for printer's instances.
* Support for stdint (i.e, '-') as filename from command line.
Interface improvements:
* About box's link is now clickable (#45).
* "Open" and "Save As" dialogs now use extension patterns in
addition to mime types filters (#50).
* Full screen support.
* "Save As" dialog sets the current file's name as the default
save name.
Bug fixes:
* Prevent showing the menu entry twice.
* Fixed typo that check for Poppler version 0.5.2 or higher in
order to show the index).
* The cache is emptied between file loads, so the previous
file's page are displayed.
* Changed the "Save As" dialog's button from "Open" to "Save".
* Prevent crashes in FreeBSD when searching in a document.
* Fixed some bugs rendering pages under some systems.
* Fixed problems printing documents under some systems, specially
64-bit systems.
