Added fix_permissions plugin
a little refactoring
did even more refactoring with the suggestions of sampsyo. added documentation page
created a function to convert permissions to oct
fixed plugin toc in docs
added not working test for debugging
print google sources url

when releasing a beets version, run the script before running test_lyrics.py, and copy/paste the sources listed on stdout as a bulk add on Google CSE so beets engine is up-to-date.
plugin now listens for item_copied instead of after_write. now the test works
Merge pull request #1098 from xsteadfastx/master

Added fix_permissions plugin
Docs/changelog for permissions (#1098)