getUrlContent should take proxy setting into consideration when not using curl, as well

Thanks Bart for the hint.
This also switches "==" to "<>" and not the code actually works ;-)

https://github.com/owncloud/core/issues/504

Thanks Bart for the hint.
This also switches "==" to "<>" and not the code actually works ;-)

https://github.com/owncloud/core/issues/504

add a check and a warning if the ownClodu server is not able to establish http connections to the internet. The reason is that users complained that external filesystem support, the update checker, downloading of new apps or the nowledgebase don´t work and don´t know why.

Fixes #160

Before, the CSRF token expired every hour. We had a script in place
which should refresh the token but this don't worked in every case.
(Laptop sleeping etc.)

With this commit, the token will only get once created for every
session so that the "Token expired" warning shouldn't appear.

first in new branch