Issue title: Garrys Mod 13 addon failure (FIX)
 Issue body: If you guys ever wondered how you did not get all your addons back one reason to fix this problem. All you have to do is re-install Garry's mod 13 after you re-installed it you will have all your addons back and fully updated, with out having to look for your addons that have been gone. Ive found out that there is .gma files in your addons folder that has your addons there. The re-installed Garry's mod will find the missing addons and install them when you have re-installed Garry's mod 13. Add me on steam ryandan12 and thx him for this simple fix.

 Comments: 
 Comment 0: http://facepunch.com/forums/16

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