Updated OAuth2 for Gmail tasks

[Alexey Panteleev]

Hello,

In the end of Nov'11 Google updated its OAuth2 authorization
procedure for their tasks API. As a result our users stopped getting
redirected to google authorization page and could not check the
"import tasks" option of their gmail connector. We noticed this only
later in Dec'11.

Now we have finally upgraded to the newer google libraries and
updated the procedure according to the new google guidelines. Those
who were not able to enable the Gmail tasks sync in the past please
try this again now. After checking the "import tasks" option and
saving the gmail connector settings you should be redirected to the
google authorization page asking to allow Yoxel Portal to access your
gmail tasks.

Cheers,
Alexey