inline: Add support for code blocks.

This should be backwards compatible. In case the the path field
isn't a statement, beets will assume it's a block of code that
stores the value in a special '_' variable.
Merge pull request #72 from flz/master

Add support for code blocks to inline plugin
GH-72: some cleanup and changelog note
GH-72: use function bodies instead of special var
remove outdated "art" config in docs
happy new year :sparkles:

For future reference, this command did the trick:
ack -l 'Copyright 201' | xargs perl -pi -E 's/Copyright 201./Copyright 2013/'
lyrics: replace apostrophes with ' (GC-498)
terminal_encoding config option (GC-472)
configurable MusicBrainz host/rate limit (GC-408)
configurable match thresholds (GC-290)
backported lyrics fix
replaygain: catch Unicode exc on Windows (GC-499)
(grafted from 89cee0e842b4e553790b0db7daaf2fd31d217e15)

--HG--
extra : source : 89cee0e842b4e553790b0db7daaf2fd31d217e15
fix RewritePlugin initialization

Error was introduced in 6d68a48
Merge pull request #73 from jhawthorn/rewrite_fix

fix RewritePlugin initialization
importfeeds migration: remove prefix (GC-503)
merge
fix the expanduser of the importfeeds dir configuration
importfeeds: add relative_to config
importfeeds: document the relative_to configuration option
Merge pull request #74 from phmongeau/relative_feeds

relative importfeeds m3u path