Pympress

Mainly a big refactor, some bug fixes linked to logging behaviour on Windows thanks to r5r3

Novelties:
- Possibility to rearrange layout in config file (see here for how the constraints on the json string's content: https://cimbali.github.io/pympress/options.html#layouts),
- ctrl + click now emulates a laser pointer on screen,
- various bug fixes,
- menu of recently opened files,
- any errors now are logged to a file named pympress.log in the current directory

Should fix 18

Buf fixed on Mac OS X where pymprepss crashed due to trying non-portable things for translation. This is fixed now: translation works if python can find `libintl.dylib` and otherwise fails gracefully (i.e. no crash).
Thanks to brianmay for reporting the bug and testing the fix.

Other novelty, a German translation, work of FriedrichFroebel

Reached all the remaining goals for the 1.0 release. Some bug fixes, rewrite of UI using glade files, and following new features:
- translation (only French so far)
- improved view with annotation slide (notes in big, current + next in side bar)
- ability to draw on the slides
- option to show big buttons for touch screens/controllers
- smoother resizing of panes (especially on windows)
- possibility to open pympress without a pdf file, and to open/close files with pympress open
- documentation hosted in the same branch, and available through pympress.xyz
- distribution [via pypi](https://pypi.python.org/pypi/pympress/1.0)

Many features, including contributions from Christof Rath (nobecutan), incrementing on his v0.5.

Portability: bringing pympress up to speed on all platforms
- various look & feel improvements on Mac
- screensaver and video support on Windows
- fixed segfault on Linux, apparently due to non-thread-safe interactions between xlib and gtk/gdk

New features:
- displaying text annotations
- estimated talk time
- stable support for video through a VLC plugin (requires VLC of the same bit-ness as python, it 32 bits or 64 bits)

Other improvements:
- setup scripts now use entry points and uniquely defined version number
- separate options (fullscreen, etc) from startup options in two menus next to each other
- various bugfixes