Squirrel 2.1.1 stable released

-vm refactoring
-optimized internal function memory layout
-new global symbol _version_ (is the version string)
-code size optimization for float literals(on 32bits float builts)
-now the raw ref API(sq_addref etc...) is fully reentrant.
-fixed a bug in sq_getdelegate() now pushes null if the object doesn't have a delegate(thx MatzeB)
-improved C reference performances in NO_GARBAGE_COLLECTOR builds
-sq_getlocal() now enumerates also outer values.
-fixed regexp library for GCC users.