Added search provider icons. Added network logos.

Added search provider icons. Added network logos.

Fix https://github.com/SiCKRAGETV/sickrage-issues/issues/18
Fix https://github.com/SiCKRAGETV/sickrage-issues/issues/240
Fix https://github.com/SiCKRAGETV/sickrage-issues/issues/250

(My first pull request, so hopefully it works.)