add CCLuaObjcBridge

Call Objective-C form Lua, and call Lua from Objective-C.

-   Call Objective-C Class Static Method from Lua
-   Pass aruments to Objective-C
-   Pass Lua function to Objective-C
-   Call Lua function from Objective-C


### Lua code:

~~~ lua
local args = {
    username  = "dualface",
    password  = "123456",
    autologin = true,
    callback  = onLogin
}

local ok, ret = CCLuaObjcBridge.callStaticMethod("MySDK", "login", args)
if ok then
    -- call success
    print("ret = ", ret)
else
    -- call failure
    print("error = ", ret)
end
~~~

### Objective-C method:

~~~ objectivec
#include "CCLuaObjcBridge.h"

+ (NSString *)login:(NSDictionary *)dict
{
    NSString *username = [dict objectForKey:@"username"];
    NSString *password = [dict objectForKey:@"password"];
    BOOL autologin = [[dict objectForKey:@"autologin"] boolValue];
    int callback = [[dict objectForKey:@"callback"] intValue];

    if (.....)
    {
        CCLuaObjcBridge::callLuaFunctionById(callback, "ok");
    }
    else
    {
        CCLuaObjcBridge::callLuaFunctionById(callback, "error message");
    }

    CCLuaObjcBridge::releaseLuaFunctionById(callback);

    return @"something";
}
~~~