gmod_game: Made math.Rand an alias of math.random

Revision 782
Made math.Rand an alias of math.random
Fixed table.KeysFromValue
Removed alias changes from changelogChanged Files:
[ul]
[li]trunk/changelog.txt[/li][li]trunk/lua/includes/extensions/math.lua[/li][li]trunk/lua/includes/extensions/table.lua[/li][/ul]
Committed By Alexander Overvoorde