Added REST method getArtistInfo

git-svn-id: svn://svn.code.sf.net/p/subsonic/code@4117 104adb81-38d2-4886-885e-82898e39ce25
Added REST method getArtistInfo2

git-svn-id: svn://svn.code.sf.net/p/subsonic/code@4118 104adb81-38d2-4886-885e-82898e39ce25
Added REST method getSimilarSongs2.

git-svn-id: svn://svn.code.sf.net/p/subsonic/code@4119 104adb81-38d2-4886-885e-82898e39ce25
Improve layout of artist bio etc

git-svn-id: svn://svn.code.sf.net/p/subsonic/code@4120 104adb81-38d2-4886-885e-82898e39ce25