added socket.gettime()
added md5 module, implementing only function md5.sum()
Added mime module (from luasocket). Only b64 implemented
luanetLoader(): anchor required open function and class...

to keep them safe from .net garbage collector. Aslo made luanetLoader() non-static.
Modules: Anchor all delecates passed to Lua...

to keep them safe from .net garbage collector.
LuaInterface.Test: bump to net v4.5 to silence some warnings
socket: socket.skip() same as select(). :settimeout() accept nil timout.
forgot to anchor some delegates in 43a061fcde61c7d055cdfab5c341f7acdbe63824

modules socket and bit32. Also fixed socket.skip skip-count.
And fixed handling of buffered data for sock:receive(n)