Update omnicoin.php

Should use $mybb->input not $_GET
Update omnicoin.php
from FGC to Curl

Changed all Filegetcontents to curl with a timeout and fixed a small error.
Update omnicoin.php
Merge pull request #1 from dotMatt/patch-2

from FGC to Curl
Update README.md
Update README.md
Update README.md
Update omnicoin.php
Update omnicoin.php
Update omnicoin.php
Update omnicoin.php
Update omnicoin.php
Update omnicoin.php
Update omnicoin.php
Update omnicoin.php
Update omnicoin.php
Update omnicoin.php
Update omnicoin.php
Update omnicoin.php