Check item in menu to disable uploading

[izidormatusov]

The most of the time, I don't need to upload my screenshots to a server. Sometimes I need quickly send a screenshot to somebody over IM and uploading is would be great. Going into Preferences dialog and changing server takes too much time.

What about an item in menu to temporary disable uploading? Something similar as Set delay menu. It would save disk space on servers and not every screenshot I made is published somewhere...

[izidormatusov]

I've implemented this in my branch at https://github.com/iyonius/lookit