Make a cache for feed favicons and serve them from owncloud server

[Revertron]

IMPORTANT

Read and tick the following checkbox after you have created the issue or place an x inside the brackets ;)

• [x] I have read the CONTRIBUTING.md and followed the provided tips

  Explain the Problem

The favicons are loaded every time from sites of the feeds. It would be better to load them and save to some cache folder and link to that folder on owncloud server. It would be more secure.

System Information

• News app version: 8.7.4
• ownCloud version: 9.0.2
• PHP version: 5.6
• Database and version: mysql 5.5
• Browser and version: Firefox 46.0.1
• Distribution and version: Debian jessie

  Contents of Browser Error Console

Read http://ggnome.com/wiki/Using_The_Browser_Error_Console if you are unsure what to put here

Did you see even one time how much problems are there?

[BernhardPosselt]

Nope, actually it would be less secure since the same origin policy would be defeated :)

Did you read https://github.com/owncloud/news#my-browser-shows-a-mixed-content-warning-connection-is-not-secure ?