Removed a bunch of import *
Refactor plugin loading code.
Fix torrent_scrub dependency loading
Add error handling to description rendering
Change pushover priority to last to prevent repeated messages due to failing plugins
Minor improvements for rss template.
Cleanups for plugin.py
Fix priority on pushover
Added .gitattributes to deal with line endings.

- https://help.github.com/articles/dealing-with-line-endings
Normalize line endings.
Move priority of all notification outputs to last.
History plugin enhancements.

- Argument --history now accepts optional number of entries to show. Fixes #1272
- History plugin can now be disabled with 'history: no'
Merge branch 'master' of https://github.com/Flexget/Flexget
Set default for rss plugin all_entries option to true.