Log Message:
Update xmoto to 0.5.11.

Changelog:
X-Moto 0.5.11 2014-03-29
--------------------------------
 * handles lua 5.2 library loading changes

X-Moto 0.5.10 2012-06-21
--------------------------------
 * libpng & liblua patch by Kelly Anderson
 * include ode/ccd integrated in sources for windows to avoid crashes 
   due to ode.dll when linked to other dll (root cause still not found) 
   (microsoft windows support again)
 * minor changes (configurable admin console shortcut, banner name with 
   lsbans command)

X-Moto 0.5.9 2011-11-13
--------------------------------
 * fix a compilation error with libxml

X-Moto 0.5.8 2011-09-27
--------------------------------
 * no more need to disconnect/reconnect to change net mode
 * ctrl+n to change from ghost mode to slave mode and so on (or the checkbox)
 * replace tinyxml by libxml2 (new dependancy)
 * xmoto 0.5.8 doesn't support microsoft windows (xmoto.exe crashes at 
   startup since libxml2 integration is done, i don't know why).

X-Moto 0.5.7 2011-04-08
--------------------------------
 * fix a bug that make xmoto crashes
 * improve network performances

X-Moto 0.5.6 2011-03-26
--------------------------------
 * dark background behind the chat messages
 * add ctrl+p to prefill chat box with previous private recipients
 * new options : --serverPort and --serverAdminPassword
 * server rules system (points in slave mode)
 * possibility to send a report on the website when a level crashes
 * monospace font for the admin console (DejaVuSansMono.ttf)
 * performances improvements (mainly for the server)
 * update munin plugins
 * fix some bugs (if you win and lost at exactly the same time, you 
   lost)

X-Moto 0.5.5 2011-01-21
--------------------------------
 * replay support for physics levels
 * improve network mode performances
 * private message support on network interface
 * several keys are now customizable via the options
 * GetPlayerProfileName script function is now deprecated
 * some minor fixes

X-Moto 0.5.4 2010-11-30
--------------------------------
 * Add a button in the network tab to join levels played by other people
 * Remove the downloading ghost screen (background download)
 * Add a button to watch the replay just after death or finish
 * Add a configuration checkbox to be able to connect to the server at 
   startup
 * Add 2 configuration control keys to change the chat history
 * Display time required for the next medal in game
 * Completion for chat box and server console
 * Change default chineese font name from wqy-zenhei.ttf to 
   wqy-zenhei.ttc
 * fix played time counted 2 times when using checkpoints
 * minor bugs fixed