create consistent api endpoint for downloading the windows installer
allow downloading multiple versions of the windows installer; move base
installation url to settings
Merge pull request #1627 from aronasorman/1625

create consistent api endpoint for downloading the windows installer
Fixing order of operations in setGetParam
Fixing correctness of setGetParam
Adding in accouncements app.
Adding code to incorporate announcements.
Deleted showing announcement body; played with styling.
Moving announcements app into python-packages
Adding migrations, including app only for central server
Setting site_wide default to True, since nothing shows unless it's site-wide!
Mark HTML as safe, so that it comes through clean.
Always clear the cache on server restart, as we really can't tell what's changed.  Also, always hit the server for a search request to check if the search tree has changed, but only re-parse the result if something changed.
Merge pull request #1630 from bcipolli/1561

Fix for search caching issues (#1561, #1626, and maybe #1563)
Inform user of what's being done when starting the server, move a cache invalidation to a better place in videoscan.
Fix for #1563: filter results AFTER excluding unavailable videos.
Fix for #1632 - only do initialization when we know the server won't reload itself.
Merge pull request #12 from bcipolli/1624

1624
Didn't know ben wanted centered text!
Merge branch '1624' of https://github.com/dylanjbarth/ka-lite into 1624