fix RewritePlugin initialization

Error was introduced in 6d68a48
importfeeds migration: remove prefix (GC-503)
fix the expanduser of the importfeeds dir configuration
importfeeds: add relative_to config
importfeeds: document the relative_to configuration option
cleanup, docs, and changelog for relative_to (#74)
add thanks to changelog note for #74
allow convert to be used without embedart enabled
document migration from 1.0 to 1.1
input_options: fix highlighting when require is on

Previously, even when `require` was True, the first option was highlighted as
if it were the default.
Implements support for WMA/ASF

 * Adds support for importing/managing .wma and .asf files
 * Adds support for all available ASF tag equivalents
 * Adds two utility methods for (un)packing embedded ASF pictures
 * Modifies scrub plugin to work around the lack of a delete method on
   ASFTags object.
Safely cast ASFBoolAttributes

 * Modify _safe_cast to account for ASFBoolAttributes
silence Unidecode warning due to byte string info

--HG--
extra : source : 6a023b1f3ace0ae3177afb382d0eebcb445bec05
version bump and changelog summary for 1.1b1
Added tag v1.1.0-beta.1 for changeset 6f29c0f4dc70
Map a few more tags to custom/nonstandard attributes

 * Adds TotalTracks, TotalDiscs, MusicBrainz/ASIN and
 * Acoustid/Fingerpint
Add database_change event
Add cli_exit event
Add lib param to database_change event
version bump: 1.1b2