Update README.rdoc

use ruby 1.9 hash syntax
Merge pull request #62 from qblake/patch-1

Update README.rdoc
Merge pull request #63 from sebweaver/master

Add 2 methods for "tag"
update README
s/lastfm.jp/last.fm/g
update README
version bump to 1.23.0
use Markdown for README
fix README
Revert "fix README"

This reverts commit 53f7c0927a8d2ee8d43b7acaa80b3d8506e956ec.
fix README
remove synopsis for deprecated API
fix link
Allow artist's mbid as an alternative for artist's name