Fix bug

[ymback]

Blizzard use new auth api hosts as the file shows, different region have different api host, actually we can use https to access, in my site, I use curl to access the https api hosts. The function elapsedtime() in file 'Authenticator.php' has a overflow bug, which may return minus value, fixed. I have builded a site, modify Authenticator class and use it as a library, so does it possible to add my info to "Who use it" in the README.md.

Signed-off-by: ymback [email protected]