Bug fixes

Backport from talk 6.x-1.4.

- #193977 - fix views namespace conflicts with FeedAPI
- check_url() before sending to token module
- simplify feed refreshing, using $nid instead of $vid, and improving performance slightly
- #218084 - fix cache to work with both public and private file systems
- much more efficient routine for processing feeds
- add a feed hash to determine when a feed has been updated, improves performance significantly
- improve unique feed item id to simply be a hash of title & body, which is more robust and much

Added simpletests, plus minor bugfixes.

Better support of flvmediaplayer hooks

Fixes for #234502: an image node created by mailsave_to_image_attach module is not published by default and #217516: filename header is not iso-8859-1 decoded

Just a few bug fixes. See CHANGELOG.txt