Changed licensing: LGPL 3.0 -> LGPL 2.1

To make kQOAuth compatible with Qt.
If KQOAuthManager::setHandleUserAuthorization(false) has been called there is no way to verify the token before a call to KQOAuthManager::getUserAccessToken() can be made. The new function KQOAuthManager::verifyToken() allows us to verify the token manually
Merge branch 'master' of gitorious.org:kqoauth/kqoauth
Merge commit 'refs/merge-requests/10' of git://gitorious.org/kqoauth/kqoauth into merge-requests/10