Added Discogs search plugin.
fetchart (issue 459): use regex to detect valid image names + 'cautious' option for finer control of filename matching
Add a query class for years with support for ranges.
Add error message and test for invalid years.
Well, really add it...
Merge pull request #259 from dsedivec/master

Clarify fetchart docs, and a couple corrections
fix link to MusicBrainz albumtype docs
Use re.search instead of re.match with simplified regex.
Add additional cover_names parameter to art_in_path, and makes 'cover_names' a  plugin config option.
Fix unit tests by constructing a FetchArtPlugin in the
fixture and using 'art.jpg' as default image filename so that 
'cautious' option does not interfere with the tests.
fetchart: document 'cautious' and 'cover_names' options
Merge branch 'fetchart-459' of git://github.com/KraYmer/beets

Conflicts:
	docs/plugins/fetchart.rst
API/test enhancements for #257

Also, `cautious` defaults to False for backwards-compatibility.
changelog for #257
Update fetchart.rst

fix option name and provided example
changelog summary
spell check
Added tag v1.1.0 for changeset 97f04ce25233
Merge branch 'master' of git://github.com/sampsyo/beets
Added a -e option to random that makes the distribution even among artists
"Modify" for non-string values

Added the possibility to modify float, integer e bool values (using explicitly true/false)