Cache generated album art


git-svn-id: svn://svn.code.sf.net/p/subsonic/code/trunk@3803 104adb81-38d2-4886-885e-82898e39ce25
In main.jsp, single songs are downloaded as zip files.


git-svn-id: svn://svn.code.sf.net/p/subsonic/code/trunk@3804 104adb81-38d2-4886-885e-82898e39ce25
Changed language in subscription renewal email.

git-svn-id: svn://svn.code.sf.net/p/subsonic/code/trunk@3805 104adb81-38d2-4886-885e-82898e39ce25
Javascript "const" doesn't seem to work in IE.

git-svn-id: svn://svn.code.sf.net/p/subsonic/code/trunk@3806 104adb81-38d2-4886-885e-82898e39ce25
Fixed some minor Javascript bugs.

git-svn-id: svn://svn.code.sf.net/p/subsonic/code/trunk@3807 104adb81-38d2-4886-885e-82898e39ce25
Updated REST API doc

git-svn-id: svn://svn.code.sf.net/p/subsonic/code/trunk@3808 104adb81-38d2-4886-885e-82898e39ce25
Upgraded to 4.9.beta4

git-svn-id: svn://svn.code.sf.net/p/subsonic/code/trunk@3809 104adb81-38d2-4886-885e-82898e39ce25
Updated change log

git-svn-id: svn://svn.code.sf.net/p/subsonic/code/trunk@3810 104adb81-38d2-4886-885e-82898e39ce25
Remove license
Merge branch 'master' of https://github.com/daneren2005/Subsonic-Test