Add ip address on Ampache login failure log (fix #470)
add curl to requirements as optional

Since I notices the installer checks for `curl` it might as well be listed as an optional requirement.
Remove not ascii character from TXXX id3v2 tags
Merge pull request #472 from victorhaggqvist/patch-1

add curl to requirements as optional
Don't merge album without mbid with same album name with mbid